Tourists
Two tourists who are at a distance of km from their camp must reach it together in the shortest possible time. They have one bicycle which they decide to use in turn. One of them started walking at a speed of km/h and the other rode off on the bicycle at a speed of km/h. The tourists agreed to leave the bicycle at intermediate points between which one walks and the other rides.
What will be the mean speed of the tourists (in km/h)?
The answer is 7.5.
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