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A and B can together do a piece of work in 15 days. B alone can do it 20 days. In how many days can A alone do it?

30 days
40 days
45 days
60 days

Correct Answer: 60 days

Explanation:

A's 1 day's work = (1/15 - 1/20) = 1/60
∴ A alone can finish it in 60 days.

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