The Puzzle: If I drive half-way to the city at 30 km/hour, how fast do I have to go for the rest of the way to make the average speed for the entire journey of 60 km/hour?
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(Scroll down if you really want
to see the Solution ...)
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The Solution . . .
You should be there already!
You are half way there, and want to double your average, so your speed would have to be infinite.
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The Puzzle: If I drive half-way to the city at 30 km/hour, how fast do I have to go for the rest of the way to make the average speed for the entire journey of 60 km/hour?
