2017 AMC 10A Problems/Problem 9

Minnie rides on a flat road at 20 kilometers per hour (kph), downhill at 30 kph, and uphill at 5 kph. Penny rides on a flat road at 30 kph, downhill at 40 kph, and uphill at 10 kph. Minnie goes from town A to town B, a distance of 10 km all uphill, then from town B to town C, a distance of 10 km all uphill, then from town B to town C, a distance of 15 km all downhill, and then back to town A, a distance of 20 km on the flat. Pennygoes the other way around using the same route. How many more minutes does it take Minnie to complete the 45-km ride than it takes Penny?

                          (A) 45               (B) 60                (C) 65               (D) 90               (E) 95