 Hello and welcome to the session I am Deepika here. Let's discuss a question which says water in a canal 6 meter wide and 1.5 meter deep is flowing with a speed of 10 kilometer per hour. How much area will it irrigate in 30 minutes if 8 centimeter of standing water is needed? Now we know that volume of a cuboid is equal to length into breadth into height. It is given by the formula speed is equal to distance upon time, distance is equal to into time. So this is a key idea behind our question. We will take the help of this key idea to solve the above question. So let's start the solution. Now we are given the width of the canal equal to 6 meter depth of the canal equal to 1.5 meter. Now it is given water in a canal is flowing with a speed equal to 10 kilometer per hour and this is equal to 1000 meter. Water is flowing with a speed of 5000 meter 30 minutes it irrigate in 30 minutes. Therefore volume of water in 30 minutes is the volume of cuboid. Length is 5000 meter, width is 6 meter and depth is 1.5 meter. This implies volume of water flowing in 30 minutes is equal to volume of cuboid. Now we have a formula for volume of cuboid as l into b into h. Therefore volume of water flowing in 30 minutes is equal to 5000 into 6 into 1.5 meter cube. Let meter square be the area irrigated in 30 minutes. Now height of the standing water needed is 8 centimeter which is equal to 8 upon 100 meter because 1 meter is equal to 100 centimeter. Now volume of water flowing in 30 minutes is equal to area irrigated in 30 minutes into of the standing water needed. So this implies 5000 into 6 into 1.5 is equal to x into 8 upon 100 and this implies x is equal to 5000 into 100 into 6 into 1.5 upon 8. So on cancellation we have so this implies x is equal to 2500 into 5 into 3 into 15 meter square. Therefore area irrigated in 30 minutes is equal to 562500 meter square or we can say this is equal to 56.25 hectares because 1 hectare is equal to 10000 meter square. Hence the answer for the above question is the area irrigated in 30 minutes is 56500 meter square or 56.25 hectares. I hope the solution is clear to you. Bye and take care.