A fast car can go from 0 to 90 mph in 7.0 s, and a slow car can go from 0 to 45 mph in 7.0 s. If Pfast is the average power of the fast car's engine, and Pslow is the average power of the slow car's engine, then which describes the relationship between Pfast and Pslow?

a. Pfast = 4Pslow
b. Pfast = 3Pslow
c. Pfast = 2Pslow
d. Pfast = Pslow