a round-trip took 12 hours. The first half of the trip took 7 hours at a rate of 45 miles per hour. What was the average rate of speed on the return trip?

Question

 a round-trip took 12 hours. The first half of the trip took 7 hours at a rate of 45 miles per hour. What was the average rate of speed on the return trip?

Answer 1

distance = speed x time

45 x 7 = 315 miles one way

X x 5 = 315 the other way

X = 315/5 = 63 mph