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A and B can complete a piece of work in 12 and 18 days respectively. They work together for 4 days, after which C joins them and the remain…

1456Medium DSSSB TGT Computer Science 0 replies 1 views

A and B can complete a piece of work in 12 and 18 days respectively. They work together for 4 days, after which C joins them and the remaining work is finished in 2 more days. In how many days can C alone complete the whole work?

Correct answer: B

Explanation

A + B complete 4 × 5/36 = 5/9 in 4 days, leaving 4/9; the three together do this in 2 days (2/9 per day), so C's rate = 2/9 − 5/36 = 1/12 and C alone takes 12 days.

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