Answered

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Kiyoshi can paint a certain fence in 3 hours by himself. If Red helps, the job takes only 2 hours. How long would it take Red to paint the fence by himself ?

Sagot :

AL2006

Kiyoshi paints  1/3  of the fence each hour.

When the friends work together, they paint  1/2  of the fence each hour.

So Red must be painting  (1/2 - 1/3) = 1/6  of the fence each hour.

The rate of  1/6 fence per hour means  1 fence per  6 hours  for Red alone.


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