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A train went 300 miles from City X to city Y at an average rate of 80 mph. At what speed did it travel on teh way back if its average speed for the whole trip was 100 mph?

A. 120 mph
B. 125 mph
C. 133 1/3 mph
D. 137 1/2 mph
E. 150 mph
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সঠিক উত্তরঃ C. 133 1/3 mph
Explanation: