Question

a river 3 m deep and 40 m wide is flowing at the rate of 2 km per hour. how much water will fall into the sea in a minute

Answer 1

Area of cross section of the river =

3 ×40 = 120 square m

Now,

Volume of water flowing through this cross section in every minute

V = Area × rate of flow

= 120×2 km/hr

= 120×(2000/60) meter/min

= 2 ×2000

V= 4000 cubic m

Since 1 m^3 = 1000 litres

So

4000 m^3 = 4000 ×1000

Water flow in 1 minute = 4000000 litres

Answer 2

Answer:

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A river 3 m deep and 40 m wide is flowing at the rate of 2 km per hour. How much water will fall into the sea in a minute?

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