Average Speed Over Both Journeys

Posted On Fri, 30 Nov 2012

Filed under Mathematics
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This question is sometimes asked on the GMAT exam, allegedly.

A woman drives to work every morning at an average speed of 30kmph. In the evening, she drives home the same distance at an average speed of 40kmph. What is her average speed over both journeys?

HINT: The answer isn't 35kmph!

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