Question

a river is 10 meter deep and hundred metre wide. it is flowing at the rate of 7.5 km per hour. find the quantity of water that runs into the sea per second

Answer 1

here comes the formula
Q=v*a
hence v=7.5km/h=2.1m/s
area=10*100=1000m2
hence the answer is Q=2.1*1000 m3/s
=2100m3/s