A train went 300 miles from City X to City Y at an average speed of 100 mph. At what speed did it travel on the way back if its average speed for the whole trip was 120 mph?
A. 120 mph
B. 125 mph
C. 150 mph
D. 130 mph
সঠিক উত্তরঃ
C.
150 mph
Explanation:
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