A rectangular tank, 32in long, 20in wide and 15in high, is filled with water up to 3/8 of its height. If the tank is going to be filled by water from a tap flowing at 5 cubic inches a minute, how much time is needed to fill the rest of the tank?
It needs minutes to fill up the tank.
The volume of the tank
32 in × 20 in × 15 in = 9600 in3
9600 in3 × 3/8 = 3600 in3
Need to be filled:
9600 - 3600 = 6000 in3
6000 ÷ 5 = 1200 minutes
It will take 1200 minutes to fill up the tank.