1 . 50 men took a dip in a water tank 40m long and 20m 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. 25 cm
- B. 30 cm
- C. 35 cm
- D. 50 cm
- D. None of these
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