Question

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A RIVER 2M DEEP AND 45M WIDE IS FLOWING AT THE RATE OF 3KM/HR. FIND THE QUANTITY OF WATER THAT RUNS INTO THE SEA PER MINUTE.

Answer 1

Given that a river 2m deep and 45m wide.

Area of cross section of river = 2 * 45

                                                 = 90m^2.


Given that water is flowing at the rate of 3km/hr

The volume of water flowing through this cross section in every minute is:

= 90 * 3km/hr

= 90 * 3000/60 m/hr

= 4500m^3 (or) 4500000litres.


Hope this helps!

Answer 2

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Answer

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Rate of water flow in a sea = 3 km / hour

= 3000/ 60 m / min

= 50 m / min

Depth (h) of river = 2 m

Width (b) of river = 45 m

Volume of water flow that runs into the sea in 1 min = 50 x 45 x 2 = 4500 m3

Therefore, in 1 minute, 4500 m3 water will fall in the sea.

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