Two men, 20 miles apart, began racing toward each other. The instant they started running, a fly on the nose of one man started flying towards the nose of the other man. As soon as it reached the second man's nose, it turned around and flew back to the first man's nose, and so on until the men met.

If each man ran at a constant speed of 10 mph, and the fly was flying at 15 mph constantly, how far did the fly fly?

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