Question

A rectangular water reservoir is 25m × 18m at the base. Water flows into it through a pipe whose cross section is 9cm × 6cm at the rate of 20 meters per second. Find the height to which the water will rise in the reservoir in 36 minutes

Answer 1

area of rectangular base is equal to 25 m into 18 m
Area of rectangular tank = 25*18*h
volume of water flowing in 36 minutes is equal to 36 x 60 x 108 / 1000 = 233.28 m^3

area of rectangular tank is equal to area of cylinder

25 * 18 *h = 233.28 metre cube
h = 223328 / 100 x 1 /18 x 1/25
=0.52m