Question

A rectangular reservoir is 120m long,and 75cm wide .at what speed per hour must water flow into it through a square pipe of 20cm wide so that the water rises by2.4m in 18hrs.

Answer 1

to rise by 2.4m in 18 hours, the volume must increase by

120*.75*2.4 = 216 m^3/hr

the square pipe has cross-section area of .2^2 = .04 m^2

216 m^3/hr / .04m^2 = 5400 m/hr