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作者: 平正   网上数学题: 2011-05-06 15:50:59  [点击:3690]
Two boats are crossing the river from opposite sides.
When they first meet, they are 720 feet from the near shore.
When they reach the opposite shores, they stop for 10 minutes
and cross the river again, but this time they meet 400 ft from the
far shore. How wide is the river?

加跟贴

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