A cylindrical pipe empties a spherical tank full of water at the rate of 25/7 litres per second. How much time will it take to empty half of the tank if the radius of the tank is 3 meter?
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radius of hemispherical tank = 3/2m
volume of tank = 2/3*22/7*3/2*3/2*3/2 = 99/14 m3 =99000/14L (1m3= 1000L)
half the tank = i.e 99000/14 * 1/2 = 99000/28 L
now,in 1 sec = 25/7 L of water is emptied
Required time
= 99000/28 / 25/7
= 99000/28 * 7/25
= 990 sec
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