A cyclist covers his outward journey at 15 mph.

The return, over exactly the same distance, is uphill. He completes it at 5 mph.

What is the cyclist's average speed over the entire journey?

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A cyclist covers his outward journey at 15 mph.

The return, over exactly the same distance, is uphill. He completes it at 5 mph.

What is the cyclist's average speed over the entire journey?

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