A hiker walking at a constant rate of 4 miles per hour is passed by a cyclist traveling in the same direction along the same path at a constant rate of 20 miles per hour.The cyclist stops to wait for the hiker 5 minutes after passing her, while the hiker continues to walk at her constant rate.How many minutes must the cyclist wait until the hiker catches up?
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发表于 2010-8-19 15:33:36
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