An ambulance travels 10 miles at a speed of 50 miles per hour. how fast must the ambulance travel on the return trip if the round trip travel time is 20 minutes?

A 75 mph
B 55 mph
C 60 mph
D 65 mph

Correct Answer: 75 mph

Given, Distance = 10 miles, speed = 50 miles per hour Time taken = distance ÷ speed = 10÷ 50 = 1/5 hour = 1/5×60 = 12 mins Total time = 20 mins Time for returned trip = 20 - 12 = 8 min 8 mins = 8/60 = 2/15 hours Speed = distance ÷ time = 10 ÷ 2/15 = 10 × 15/2 = 150/2 = 75 mph (ans)
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