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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 .  20 cm
B .  25 cm
C .  35 cm
D .  50 cm
Answer: Option B

Total volume of water displaced = (4 x 50) m3 = 200 m3.

So, Rise in water level = \(\left(\frac{200}{40\times20}\right)m0.25m=25cm.\)

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