500 persons took a dip in a rectangular tank which is 80m long and 50m broad . What is the rise in level of water in the tank , if the average displacement of water by a person is 0.04m³

500 persons took a dip in a rectangular tank which is 80m long and 50m

1.	500 persons took a dip in a rectangular tank which is 80m long and 50m broad . What is the rise in level of water in the tank , if the average displacement of water by a person is 0.04m³
Answer» The volume of one person = 0.04 m³ , be CAUSE when the person takes a dip in the TANK, the amount of water displaced is equal to the volume of the person. 500 PEOPLE take dip at the same time, then water displaced = 500 * 0.04 = 20 m³ the water rises inside the tank of the area of 80 m * 50 m = 4000 m². The HEIGHT to which water rises = volume / area = 20/ 4000 = 1/200 m =0.005 m = 5 millimeters