The top speed of a cheetah is approximately 1.2 × 10^2 kilometers per hour, while the speed of the fastest human is approximately 4 × 10^1 kilometers per hour. how many times faster is the top speed of a cheetah than the speed of a human?

Two cars which are 40 miles apart start moving simultaneously in the same direction with constant speeds. if the speed of the car which is behind is 56 mph and the speed of the other car is 48 mph, how many hours will it take for the car which is behind to catch up the car ahead of it?