Question

A can complete a job in 20 hours. B alone can complete the same job in 15 hrs. A work for 9 hrs and then the remaining job is completed by
B. How many hours will B be alone take to complete the remaining job?

A 8 *1/4 hrs
B 6 *2/7 hrs
C 5 *1/9 hrs
D 9 *5/6 hrs
E None of these
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