Leisa315 Leisa315

20-05-2015
Mathematics

Answered

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 ?

Verified Answer :

20-05-2015

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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