Question

500 men took dip in a tank which is 80m long, 50m broad. What is the rise in water level if the average displacement of water by a man is 4m³?

Answer 1

Displacement of water by 1 man = $4m^3$
Displacement of water by 500 men = 4*500 = 2000$m^3$
Area of base of tank = 80*50 = 4000$m^3$
To find: Rise in water level = h
Now, lbh = displacement of water by 500 men
so, 4000*h = 2000
so, h = 0.5m
Therefore, the rise in water level is 0.5m