Algebra Help: Distance Rate and Time

[johncharipurathu]

Thank you Doctor Emmett Brown

[carlnunez11]

Very profesional explanation!!!!!!!!!!!

[Endure28]

very well explained

[quishia]

Great video! :)

[Bieberette4ever]

sooooooooooooooooooooooooooooo­oooooooooooooooooooooooooooooo­oooooooooooooooooooooooooooooo­oooooooooooooooooooooooooooooo­oooooooooooooo helpful THANKS

[saicretamor]

transposition method can also be applied.. ;p

[kiara12396]

why can't YOU be my math teacher :(

[Debedeb]

THis Guy is great . Thanks for explaining everything so we know why we do what we do and what to look for . perfect ;D

[jovanni89pliskin]

is this guy dead by now?

[VickyJ31520]

I don't understand how that equation was solved in 6X-30+3X9X-1080, did he simply add,subtract, multiplied or divided from the equation of tacking on the 30 to both sides of 3X and 9X? there is obviously something I missed there.

[Uuuuuu15]

@VickyJ31520 to get 9x, he added 3x and 6x together. since -30 isnt a like term he has to move it to the other side. to get rid of -30 on the left side, you add 30 to it and get zero. on the other side however you get 1080. To move a number to the other side always remember to do the inverse operation. since -30 is subtraction of 30, add 30.

[VickyJ31520]

@idancefun23 I thought that at first as well but then I "THINK" he solved as the problem read's that you would soon have to subtract the speed which is less then ten less than two time's the speed of the second jet after you figure out the distance of the first jet. but I don't understand if he added, subtracted, multiplied or divided from the equation of tacking on 30 to both sides of 3X and 9X to equal 1080? I've been pondering on that for the longest!

[marshandomness]

do u happen to have a video on scientific notation?

[deantiffany2008]

very helpful thank you so much

[sweetishjeebar]

Fuck yeah, totally got this shit before he explained it.

[darshanmiller]

@sweetishjeebar than y did u came to the video if u knew how to do this

[deeman1019]

I having problems with this algebra

[01JH]

Why does the distance between jet 1 and 2 need to be added when it sais "apart"? That sounds like the difference or minus.

[migueche20]

@01JH because you want to find the total distance apart.

[01JH]

@migueche20 UGH! You're right. Not reading carefully. If the planes were flying in the same direction then you'd subtract right??

[migueche20]

@01JH you got it

[MrDrUmM3r519]

thanks

[lasertracer206]

tnx

[limegreenn17]

thank you! that helped so much!

[Kuner14]

Thanks so much severly helped me understand a few things i didnt quite get when my teacher brought it up

[edelmar552]

GREAT!! Thanks!!

I've subbed

[coolkarl182]

GREAT!! THANK YOU!!

[severus14187]

well, you always give it in nice way...

[AceEliteProduction]

hi can you help me with this problem please, thank you.----------------- If the speed of an experimental car is decreased by 8km/h it completes a 140 km trip in 2 hours more than had it been traveling at its usual speed. Determine its usual speed.

[strawberryseason]

@AceEliteProduction If we let x = the usual speed, and y = the usual time it takes to drive that distance, I can set up an equation (x--8)(9+2) = 140. Since there are two unknown variables, the only way I have found to solve this problem is to substitute values for the variables. I tried to find factors of 140, which are eight units from each other. The problem solution: 28 km/hr is the usual speed, and 5 hrs is the usual time. The slower speed is 20 km/hr & to drive 140 km takes 7 hrs.

[strawberryseason]

@AceEliteProduction I figured out a way to set up the equation.. Have x equal the usual speed of the car, & 140/x is the usual time it would take to go 140 mi. The initial equation is (x -- 8)(140/x + 2) = 140 Solving this problem involves factoring a quadratic equation. If you work the above equation, you eventually get the following:

(x + 20)(x -- 28) = 0  To solve then, the only value that works (is a positive number) is 28. Thus, the usual speed of the car is 28.

[DESRUISSEAUX32]

i really appreciate this...very simplified..more tutors should use this approach..

[dontdodrugs666]

i did this...

2x - 10 + x = 1050/3

3x - 10 = 350

3x/3 = 360/3

x = 120mph is the first jet then.. 350 - 120 =

230mph is the speed of the second

[BlacksAreBeautiful]

@dontdodrugs666 i did it this way as well. is the way in the video the best way to solve or does it not matter as long as you arrive at the correct answer?

[dontdodrugs666]

@BlacksAreBeautiful indeed, there is so many ways you can get the value of the variables in algebra..

[strawberryseason]

@dontdodrugs666  That is the way that I did it, too. Very easy to do that way.

[CookiesNCream4ever]

Dont you minus 30 from both sides?

[dontdodrugs666]

@CookiesNCream4ever

no, since its a -30 it changes to positive and adds to the 1050 + 30 = 1080

[EvanYM]

thanks

[reformeddefence]

How did he get to the 120? I know that he divided 1080 by 9, the statement he made was you add 30 to both sides which i don't understand

[tiffcatz]

but what if you dont have the distance they are apart (like in this problem its 1050 miles) ??

[lilbaboo2]

HOLY SH!T. It's MR. CLEAN. THANK YOU

[polskastar81]

I have never understood how to understand word problems, but this really helped. I wish more teachers would be like you. I love the chart.

[mike02601]

you're wrong teacher....jets don't fly that slow....;lol.....

[werewolvesofmohnton]

THANK YOU SOOOOOOOO MUCH!!!!!!!!

I think i fanaly get it!!!!

[abelardo753159]

god i have my final tomorrow!!!! this really helped!!! thx

[MrMattias87]

I dont wish to be a dick, but should'nt jet 2 be 230 mph and jet 1 be 120mph?. it did say in the question that the speed of the first jet is ten less than two times the speed of the second jet.

[moreno619531]

no, jet one can't be 120 mph because it says in the problem that the first jet is 10- then 2 times more of jet two which is 230.. watch the video carefully..lol

[MrMattias87]

yeah I've watched this numerous times and I've been practising some algebra formula's too. so now I understand this clip. but thanks anyway mate.

[kennagirl887]

Thanks so much!

very helpful:)

[JayWongTV]

Thaanks! :D

I needed this

[rachellemily]

this was exactly what i needed

[euclotan]

thank you sir.

[SFRaptorJesus]

Oh my god thank you for these lessons

I would have failed the test without you

[catgotelorihinal]

thanks to you I have finished my homework and probably won't fail the math test

[tadcadnad]

Finally, a math teacher who slows down and explains the problem completely! You are great! Thank you...maybe I'll make it through MAT 090 after all.

[mbhughen]

thanks. your great instruction will really help prep for GRE-lots of these math skills are in the distant past!

[pakmyjan]

The best teacher.

[gpratts06]

wow.. i always have problems wit this type of stuff.. thank u so much.. u made it so easay..now i understand it. thanks!

[ravindraarjun]

il never get this shit

[Gemhubbyx3]

u rock man !

[appletechshow]

WOW! That is awesome, just subscribed! I LOVE THIS CHANNEL! Awesome teacher, awesome videos!

[UroborosComplex]

he's fucking awesome uh? this vids are awesome.

[eLsOlmaYoR]

a banca takes 10 hours to sail a distanece of 100 nautical miles with the current. Againts the current, it takes the banca 25 hours to sail the same distance. Find the rate of the current.

CAN ANY BODY HELP ME???PLEAESE??

[rambantu14]

the rate is 3 nautical miles/hour.

[Futureballer2009]

a plane flying at maximum speed can fly 660 kilometer with a tailwind ( a wind blowing in the same direction as the plane ) of 80 kilometers per hour. In the same amount of time, the plane can fly 540 kilometers against the same wind. What is the maximum speed of the plane when there is no wind.

[Treblaine]

wow, youtube is the gift that keeps on giving.

Smashing channel, subscribed and recommended.

[lufraef]

Thank you very much! You are truly a wonderful teacher.

[jaralipnh]

Great!

[jomusic123]

thanks this is a very good video for math.u explained it much better than my teacher

[magemager0]

thank you so much, unfortuneatly my math teacher doesnt teach us, he is intimidated by out class, i do not know why, all we really do is review our homework and we sit there while he begs us to behave, it frustrates me to no extent, so ofcourse i look to youtube, and i found it !

[dhanushka007]

Thank you for your good work, returning to school and these videos helping a lot.

[micsibulopianist]

nice.....

[micsibulopianist]

you made it too long... but very well explained..

[Wuzzi55]

*yawn*

[PopWarner12]

this is too easy

[volturia]

i wish so much that you are my teacher, i will know math in no time-.-

[majch]

This is great, what if you try to solve the problem using minutes? You'd SHOULD get a speed of 2 miles per minute for the slow jet, and then insert in the fast jet equation which would give -6 miles per minute. Obviously this doesn't make sense. O.o Can someone solve this problem using minutes?

[outlawz1351]

A lot easier than I thought it would be, keep it up!

[drummer33201]

Nice video, but personally, I like setting it up with a system of equations. :D

[typhonfighter]

Great video! I learned pretty much. And the "Teacher" Was really good!! Better than my math teacher, he's a *****

[src23]

Thank you for helping me study for my mid-term

[KodeLiMe]

Could you please do some videos on multiplying matrices? Thanks!

[phalxor]

it seems like it would be more beneficial to either comment on his page or send him a message then to comment on a random video

[Meyanfien]

I never seen this videos, and the quality of the video and sound are very great. This person teach very good, looks like a professor. Great Job!!!

[everettknag]

cool I'm in 6th grade and this made a lot of sense to me the math TV.

[bootsiebanty]

Very slow jets.

[12106720]

Its very good. Congratulation

[executivesweet]

Absolutely brilliant in his communication skills. Use of a video rather than relying on just text to teach is an incredible learning aid for someone trying to learn the concept on their own.

[s3rino]

Great, it really helps me study math without having to look through my book. Also, great voice, it's easy on the ears.

[darwinshandbag]

great

[NetDialect]

Yeah. What's this guys name anyway? He is the best speaker and always corrects his mistakes. Well done, Mr., well done.

[ydultm]

dam im smart i already knew this =]

[smexibak744]

this helps Alot!! Im taking algebra in 5 days and im going 2 8th grade. that was easy!! Thank you!!

[laysa713]

thanks a lot!! :D

[celtboxer]

I'm taking the GREs in a few weeks, and it's been almost 30 years since I've taken a math class. Your explanation is very clear. Thank you!

[lymsfriend]

nice..

[KodeLiMe]

I want this guy as a teacher instead of the jacked up on coffee flying through word problems step skipping teacher I have now.

[tamtoc]

thank you - I'm going to show a couple students your video

[jrf150]

Another way of looking at it:

1,050 miles in 3 hours equates to 350 miles in 1 hour.

x + (2x-10) = 350 3x - 10 = 350 3x = 360 x = 120

slower jet: 120 mph

faster jet: 230 mph

[shivakumar1131979]

You are real teacher