40 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 4m3 , then the rise in the water level in the tank will be: Choices: A) 25 cm B) 20 cm C) 35 cm D) 50 cm E) None of these
Explanation:   Total volume of water displaced =(4 x 40) m3 = 160 m3   Rise in water level = 160/40Ã—20= 0.2m = 20cm   Answer: 20 cm
<result>B</result>
40 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 4m3 , then the rise in the water level in the tank will be: