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Question
An emergency vehicle travels 10 miles at a speed of 50 miles per hour. How fast must the vehicle travel on the return trip if the round trip travel time is 20 minutes?
55 mph
60 mph
65 mph
70 mph
75 mph
ANSWER : 5
Descrption
<p>50 miles travel in 60 minutes </p> <p>10 miles travel in ( 60×10)/50 = 12 min</p> <p>Now, 20 - 12 = 8 min</p> <p>In 8 minutes it has to go 10 miles</p> <p>In 1 minutes it has to go 10/8 miles</p> <p>In 60 minutes it has to go ( 10×60)/8 = 75 mph</p>
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