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Bunuel
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Abhishek009
Bunuel
John always jogs to school at a speed of 6 kilometres per hour, and walks home along the same route at a speed of 3 kilometres per hour. If he spends exactly one hour total travelling both ways, how many kilometes is his school from his home ?

A. 2
B. 3
C. 4
D. 5
E. 6
\(\frac{6*3}{(6+3)} = \frac{18}{9} = 2\), Answer must be (A) 2

I thought the formula to find the average speed was (2ab)/(a+b)
Could you explain why here we do not multiply by two ?
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