Question

4. A river 2 metres deep and 45 metres wide is flowing at the rate of 3 km per hour. Find the amount of
water that runs into the sea per minute​

Answer 1

Answer:area of cross section of river= 2 x 45 = 90 m^2

so, water flowing into the sea= area of cross section x rate of flowing water

                                               = 90 x 3000

                                               = 270000 m^3

there water flowing per minute= 270000 / 60 = 4500 m^3

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Step-by-step explanation:

Answer 2

Answer: 450 cubic metre

Step-by-step explanation:

Depth of river = 2m

Width of river = 45m

Length of river per hr = 3Km or 3000m

Length of river per min = 3000m/60

= 5m

Volume of water running into the sea per min = l×b×h = (2×45×5) cubic metre = 450 cubic metre