Question

how many litres of water flow out of a pipe that has an area of cross section 15 CM square in 5 minutes if the speed of water in the pipe is 40 cm per second

Answer 1

Take one second. A plug of water 30 cm long flows out. So all you need is the cross-sectional area to get the volume. 

And that is 5 cm² x 30 cm = 150 cm³, which equals 150 mL 

Since we set the time at 1 second, that is 150 mL/s 
60s = 1 min 
150 mL/s x 60s = 9000 mL = 9 L.

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Answer 2

Answer:

Step-by-step explanation:

Given, area of the cross section of pipe = 5 cm2

Speed of the water flowing out of the pipe = 30 cm/sec

Now, volume of the water flowing out of the pipe in one second = area of the cross section * 30

                                                                                         = 5 * 30

                                                                                         = 150 cm3

 Volume of the water flowing out of the pipe in one minute = 60 * 150

                                                                                  = 9000 cm3

Since 1000 cm3 = 1 litre

So, 9000 cm3 = 9 litres

Hence, Volume of the water flowing out of the pipe in one minute is 9 litres.