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A duck paddles 4 yards downstream in 24 seconds. It takes the duck 40 seconds to paddle the same distance upstream. How fast can the duck paddle in still water ?

 Aug 7, 2020
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4 / 24 =1/6 of a yard/sec. Its speed downstream


4 / 40 =1/10 of a yard/sec. Its speed upstream


[1/6 + 1/10] / 2 =2/15 yards/sec. Its speed in stillwater.

 Aug 7, 2020

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