Mensurationhard · Past Paper
A hemispherical tank full of water is emptied by a pipe at the rate of 25/7 liters per second. How much time will it take to empty half the tank, if it is 3 m in diameter?
A16.5 min
B33 min
C8.25 min
D10 min
✓ Correct Answer: A — 16.5 min
r = 1.5m. Vol = 2/3 * 22/7 * (1.5)³ = 99/14 m³ = 99000/14 L. Half Vol = 99000/28 L. Time = (99000/28) / (25/7) = 990 seconds = 16.5 min.
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