Question

A river 2m deep and 45 m wide is flowing at a rate of 3km/hr find the qauntity of water which falls in the sea per minute

Answer 1

here comes the formula
Q=v*a

hence v=3km/h=1.3m/s

area=2*45=90m2

hence the answer is Q=1.3*90 m3/s
=117m3/s