Q. 20 4.6( 41 Votes )

A hemispherical tank, full of water, is emptied by a pipe at the rate of 25/7 litres per second. How much time will it take to empty half the tank if the diameter of the base of the tank is 3 m?

Answer :


Diameter of the hemispherical tank = 3 m

Radius of hemispherical tank = m

Volume of tank = m3

= (1m3 = 1000L)

Half the tank = L


In 1 sec = L of water is emptied

Required time


= 990 sec


= 16.5 min

To empty half the tank 16.5 min are required.

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