Tuesday, February 22, 2011

Q5-Speedy Sums

A salesman drives from Amsterdam to The Hague. The first half of the distance of his journey, he drives at a constant speed of 80 km/h. The second half of the distance of his journey, he drives at a constant speed of 120 km/h.

The Question: What is the salesman's average speed for the complete journey?

A Hint : The solution is not 100 km/h!

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