Question

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

Answer 1

Given, a river 3m deep and 40m wide is flowing at the rate of 2km per hour.

Area of cross section of the river = 3 * 40 = 120 m2

Now, volume of water flowing through this cross section in every minute = Area * rate

= 120 * 2 km/hr

= 120 * (2000/60) m/min

= 2 * 2000

= 4000 m3

Since 1 m3 = 1000 litres

So, 4000 m3 = 4000 * 1000 litres = 4000000 litres

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