Let me just be a little of topic.Originally Posted byFailing Math

You can solve this the n00bish way with infinite series. Like von Neumann

Or the good way....I summed the series...

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The two bicycles are 100 miles. Since each one travels to each other at 20 miles per hour the amount of time required is 5 hours. The fly flies at 60 miles per hour. It flys for 5 hours the total distance it travels is then 300 miles.

The same idea for 10 and 20 miles per hour