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Question

How many litres of water flows out of a pipe having an area of cross section of 5 cm2 in 1 minute, if the speed of water in the pipe is 30 cm/sec?

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Solution


Speed of the water = 30 cm/s

Area of the cross section = 5 cm2

Volume of the water flowing out of the pipe in one second = Area of the cross section × 30 cm = 5 × 30 = 150 cm3

Now, 1 minute = 60 seconds

∴ Volume of the water flowing out of the pipe in 60 seconds

= Volume of the water flowing out of the pipe in one second × 60

= 150 × 60

= 9000 cm3

= 90001000 (1 L = 1000 cm3)

= 9 L

Thus, 9 L of water flows out of the given pipe in 1 minute.

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