The fuel efficiency of a car E(s), in miles per gallon, is a function of the speed of the cars, in miles per hour. Suppose that E(60) = 40 and E(60) =0.7.(a) What are the units of E(s)?

(b) Let C(s) be the fuel consumption, in gallons per mile, of the car when it is driving s miles per hour. Find a formula for C(s) in terms of E(s). Calculate C(60).

(c) Let R(s), be the rate the car burns fuel, in gallons per hour, when the car is driving s miles per hour. Find a formula for R(s) in terms of E(s). Calculate R(60).