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?
A. 55 mph
B. 60 mph
C. 65 mph
D. 70 mph
E. 75 mph
সঠিক উত্তরঃ
E.
75 mph
Explanation:
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