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A is thrice as good a workman as B. B takes 60 days more than A to finish a piece of work. The time in which they can do it working together is (a) 25 days

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So given A = 3B so the work which is done by a is x and that work is done by b is 3x given b takes x + 60 days to complete a work so 3x = 60 + x ⇒ x = 20 so A can do work in 20 days and B can do work in 20 + 60 = 80 days so both can do the work in A + 3A = 80 + 20 days so A = 25 days so a) 25 days is the answer