Question

A river 3m deep and 40 m wide is flowing at the rate 2km /h . how much water will fall into the sea in a minute.​

Answer 1

Area of river = depth × width

=3×40

`= 120 {m}^(2)`

amount of water that falls into the sea ⇒

Area of river × flow rate

`120 {m}^(2) * 2 \: (km)/(hr)`

`120 * \frac{2 * 1000 {m}^(2) }{(60)min}`

`4000 \: \frac{ {m}^(3) }{min}`

:.
`{4000m}^(3)` of water falls into the sea per min.

So,
`{4000m}^(3)`

= 4000 × 1000 litres

= 4000000 litres

So, in 1 minute, water will fall into the sea is 4000000 litres.

Explanation:

Hope it is helpful....