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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 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? Correct Answer 133.33 mph

Average speed for same distance is given by (2×v1×v2)/(v1+v2)So, (2×80×v2)/80+v2=100160×v2=8000+100×v260×v2=80003×v2=400v2=400/3 =133.33 Ans : 133.33 mph

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