Question 39.50 men took a dip in a water tank 40 m long and 20 m broad on a religious day. If the average displacement of water by a man is 4 m3, then the rise in the water level in the tank will be:
A
(a) 20 cm
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B
(b) 25 cm
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C
(c) 35 cm
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D
(d) 50 cm
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