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Mathematics, 20.12.2020 23:00 hamada11617

A boat on a river travels downstream between two points, 90 mi apart, in 1 h. The return trip against the current takes 2 1 2 h. What is the boat's speed (in still water)?

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A boat on a river travels downstream between two points, 90 mi apart, in 1 h. The return trip agains...
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