On my way from the office to the Pimpri class, I drive at 30 kmph and on the return journey I drive at 45 kmph. What is my average speed of travel?
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37.5 km/h is incorrect as the time traveled is different in both the cases and only the distances are same. Let the distance between the office and Pimpri class be x km.
∴Time taken on my onward journey = x/30 hours and time taken on my return journey = x/45 .
∴The total time taken for my onward and return journey = x/30 + x/45 = 5x/90 hours.
The total distance traveled both ways = 2x km ∴ Average speed = 2x/(5x/90) = 36 km/h
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