A train went 300 miles from City X to City Y at an average speed of 80 mph. At what speed did it travel on the way back if its average speed for the whole trip was 100 mph?
A. 120 mph
B. 125 mph
C. 133.33 mph
D. 137.5 mph
সঠিক উত্তরঃ
C.
133.33 mph
Explanation:
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