 so here's the thing I realized this a month ago if one car one car starting from point A going 50 kilometers per hour and second car from point B going 90 kilometers per hour both have to travel 280 kilometers to end but question is when do they meet each other in two hours because 50 kilometers times 50 kilometers plus 90 kilometers equals 140 and whole distance 280 divided by 140 is two so they meet in two hours is very simple and much easier than some counting well you wouldn't be counting it you would just do the algebra for it right physics for it I haven't done this in 10 plus years and never understood it now watching this and I'm starting to understand it nice and that's what happens dragon this dragon after the fact as you get older some of the mathematics that you might have done in the past makes more sense because you have a logical sort of life experience and things may may make more logical sense that's the way it works for me anyway okay and la if you want to do your question okay let's do this physics question let's erase this watch this I remember how to do it I should remember how to do it to show very cool very cool sleepy way here's two cars here's two cars oh hold on they're gonna be they would have to start at different times we don't have a full problem here or are they traveling towards each other we need one specification I'm assuming they travel towards each other going second car from point B hold on I realize this a month ago if a car starting from point A going a second car starting from point B both travel have to travel to end a question is when did they meet I'm assuming they would have to be like us here's car a car a is going 50 kilometers per hour 50 oops 50 kilometers per hour 50 kilometers per hour here's car be car B is going 90 kilometers per hour car B is going this way car is going this way and the distance between them is 280 kilometers 280 kilometers where do they meet one car is on place a and second car going against them from the other side yeah so this would be a la right so basically we want to find out where they meet and where they meet if they leave at the same time it would be same time that they started right so your question is we need formulas for this and we need formulas for this we need our kinematics formulas the distance how should we do this distance we do a distance time so distance equals velocity times time let's do this start up with basic equation distance is equal to velocity times time over here to distance is equal to velocity times time right now the total distance this is d1 this is d2 this is d1 of e1 this is d2 and the time is going to be the same right when do they meet not where yeah when do they meet well once you figure out the where you can figure out the when as well but you do this now the total distance d total is equal to d1 plus d2 does that make sense this distance plus this distance is equal to the total distance right so the total distance d1 is v1 t plus d2 is v2 t and the total distance is just d total right now keep in mind if they left at the same time right then their times is the same because their time of traveling they left at the same time when they meet they would have been traveling the same amount of time so t is the same for both right so d total is equal to what you can do here is factor out the t because this t is the same for both so you factor out t it's common right and you got v1 plus v2 well we know what the distance is total we know what v1 is is 50 we know what v2 is is 90 so we can figure out the time so this becomes 208 oops 280 is equal to t 50 plus 90 so it's going to be 280 is equal to t times 140 and then divide by 140 so t is going to be equal to 280 over 140 the zeros kill each other and 14 goes into 28 twice so in two hours they meet does that make sense there's a nice question I like these physics questions fun physics we did math and we did physics yeah good session yes you did it exactly how I learned it awesome and it's fun to do good problem right good job thank you very much