A, B, and C can complete a work in 10, 15, and 30 days respectively. If they work together for 5 day

A. 1/2

B. 1/3

C. 1/4

D. 1/5

E. None of the above

Answer: B. 1/3

In 5 days, A, B, and C together complete 5*(1/10 + 1/15 + 1/30) = 5*(1/6) = 5/6 of the work, leaving 1/6 of the work remaining.

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