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A typing work is done by three person P, Q and R. P alone takes 20 hours to type a single booklet but Q and R working together takes 5 hours, for the completion of the same booklet. If all of them worked together and completed 15 booklets, then how many hours have they worked?
45hrs
60hrs
38hrs
55hrs
Solution: 1/P=1/20 1/P+1/Q+1/R=1/20+1/5=1/4 In 4 hours, working together, they will complete 1 booklets. Thus, 15 booklets completed in 60hrs.
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