A water tank is a rectangular box with a base which is square of side length 3 meters. At t=0 hours it has water to a depth of 5 meters.

A water tank is a rectangular box with a base which is square of side length 3 meters. At t=0 hours it has water to a depth of 5 meters. The rate water flows into the tank after t hours is 1+(t/2) m^3/hr. Make a graph of this on graph paper. Use your graph to find the depth of water in the tank after 5 hours.