Two bicyclists are 67 miles apart and are heading toward each other. Steve is traveling at an average speed of 17 miles per hour. Maria is traveling at an average speed of 12 miles per hour. A fly begins on the front wheel of Steve's bike and when he starts riding, the fly begins to fly to Marie's bike. As soon as the fly reaches Marie's front tire, it immediately turns around and flies back to Steve's tire. This continues until the two riders meet. If the fly is traveling at an average speed of 21 miles per hour, how far has the fly flown when the two riders meet?
AP calculus bicycle math problem, please help me?
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