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

A 120 mph
B 125 mph
C 133.33 mph
D 137.5 mph

Correct Answer: 133.33 mph

Total time spent = (300 + 300) / 100 = 6 hours Time spent on departure trip = 300 / 80 = 3.75 hours Time spent on return trip = 6 - 3.75 = 2.25 hours Average speed on return trip = 300 / 2.25 = 133.33 miles per hour.
Bissoy MCQ
#গণিত #গড় (Average) #Dhaka Bank Ltd #Dhaka Bank Ltd - MTO - 2004

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