A can do a piece of work in 80 days.He works it's for 10 days then B alone finish the remaining work in 42 days. then A and B together could complete the work in ....
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Ashok's 10 day's work = 10/80 = 1/8
Remaining work = (1 - 1/8) = 7/8
7/8 work is done by Bhuwnesh is 42 days
therefore whole work will be done by B in (42* 8/7) = 48 days
Therefore (Ashok + Bhuwnesh)'s 1 day's work = 1/80 + 1/48 = 1/30
Hence both together can finish the work in 30 days
understand it through unitary method
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