Question

A rectangular water reservoir 7.2 m by 2.5 m at the base. Water flow into it through whose cross section is 5 cm× 9cm at the rate of 20 m per second. find the height to which the water will rise in the reservoir in 40 minutes.

Answer 1

12m
area of cross section(cm)×rate of water flow(cm/min)
=area of rectangle(cm)×h
5×9×20×100×40×60=720×250×h
h=(5×9×20×100×40×60)÷( 720×250)
h=1200cm
h=12 m