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?

75 mph

55 mph

60 mph

65 mph

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উত্তর: 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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