SOLUTION: A and B can paint a wall in 3 days. A can do it alone in 5 days. how many days would it take for B alone?

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Question 1034699: A and B can paint a wall in 3 days. A can do it alone in 5 days. how many days would it take for B alone?
Answer by ikleyn(52818) About Me  (Show Source):
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A and B can paint a wall in 3 days. A can do it alone in 5 days. how many days would it take for B alone?
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The rate of A+B is 1%2F3 of the job-per-day.
The rate of A   is 1%2F5 of the job-per-day.

Hence, the rate of B is 1%2F3-1%2F5 = 5%2F15-3%2F15 = 2%2F15 of the job-per-day.

Answer. It will take 15%2F2 = 71%2F2 for B to complete the job working alone.

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