Question

a river 3m deep and 40m wide is flowing at a rate of 2km /h .how much water in kiter willfall into the sea in a minute ?

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.

Answer 2

Deep=3m
40m wide
3*40=120
Flowing at the rate of 2km
120\2
60 m in kiter will fall in a minute