Question

A and B can do a piece of work in 10 days, B and C in 12 days and A and C in 15 days. In what time can they do it all working together ?
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Answer 1

Answer:

and C can do it in 15 days. How long will A take to do it alone? ∴ A alone will complete the work in 24 days. Hence option [B] is correct answer.