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A and B together can do a piece of work in 12 days, B and C together in 15 days, and A and C together in 20 days. If all three work togethe…

2058Medium DSSSB TGT Computer Science 0 replies 1 views

A and B together can do a piece of work in 12 days, B and C together in 15 days, and A and C together in 20 days. If all three work together, the work will be finished in

A8 days
B9 days
C12 days
D10 days

Correct answer: D

Explanation

Adding the three pairs gives 2(A + B + C) = 1/12 + 1/15 + 1/20 = 1/5, so A + B + C = 1/10 per day, i.e. 10 days.

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