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