Question

A river 10 meters deep and 100 meters wide is flowing at the rate of 4.5 km an hour. Find how many cubic meter of water runs into the sea per second.

Answer 1

Area of cross section of river = 10×100 =1000sqm

Volume of water flow in 1 hour = Area of cross section ×Speed of water flow

V=1000× 4.5 km/h

V= 1000 ×4.5 ×5/18 m/sec

V=1250 m^3

1m ^3 =1000 liter

1250 m^3 = 1000×1250=

=======1250000 liter in 1 sec