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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.

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    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

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