River A and River B combine together to form River C. The flow rate of the River C is less than or equal to the sum of the flow rates of the Rivers A and B, but it is greater than or equal to either of the individual flow rates of Rivers A and B. One of the three rivers flows at a rate of 52 gallons per min. Another river flows at a rate of 38 gallons per min.
a. Find the minimum flow rate,f, of the third river.
b. Find the maximum flow rate,f , of the third river.
c. Write an inequality that describes the possible flow rates,f, of the third river.