Question
A alone can finish a piece of work in 10 days, and B alone can finish it in 15 days. In how many days can they finish it together?
Solution
ATQ, A’s 1-day work = 1/10 B’s 1-day work = 1/15 Together = 1/10 + 1/15 = (3 + 2)/30 = 5/30 = 1/6. So they take 6 days.
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