P alone can complete a piece of work in 13 days. Work done by Q alone in one day is equal to one-third of the work done by P alone in one day. In how many days can the work be completed if P and Q work together?	Choose the correct choice from the following answers
A) 6 (1/4) days B) 39/4 days C) 7 (3/4) days D) 8 (3/4) days E) 9 (3/4) days
Work done by P alone in one day = 1/13th of the total work done by Q alone in one day = 1/3(of that done by P in one day) = 1/3(1/13 of the total) = 1/39 of the total.   Work done by P and Q, working together in one day = 1/13 + 1/39 = 4/39 of the total   They would take 39/4 days to complete the work working together.   ANSWER:39/4 days
<result>B</result>
P alone can complete a piece of work in 13 days. Work done by Q alone in one day is equal to one-third of the work done by P alone in one day. In how many days can the work be completed if P and Q work together?