Water is pumped into a storage tank at a constant rate of r litres per minute. In 7 minutes the pump delivers 157.5 litres of water.
a. (a) Form an equation in one variable representing this information.
b. (b) Determine the pumping rate r in litres per minute.
c. (c) At the same rate, how many litres of water will the pump deliver in 24 minutes?