5. 50 men took a dip in water tank 40 m long and 20 m broad on a religious day. If the average displacements of water by a man is 4 m3, then the rise in the water level in the tank will be
A. 20 cm
B. 25 cm
C. 35 cm
D. 50 cm
Answer: B
Total number of water displaced = (4 x 50) m3 = 200 m3.
Rise in water level =
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200
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m = 0.25 m = 25 cm
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40 x 20
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