P, Q and R can do a piece of work in 24 days, 30 days and 40 days respectively. They start the work together but R leaves days before the completion of the work. In how many days is the work done?

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Q. P, Q and R can do a piece of work in 24 days, 30 days and 40 days respectively. They start the work together but R leaves days before the completion of the work. In how many days is the work done?

(A) 13 days
(B) 11 days
(C) 15 days
(D) 9 days

Correct Answer - Option(B)

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