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A. 9(3/5) days
B. 9(1/5) days
C. 9(2/5) days
D. 10 days

Amount of work P can do in 1 day = 1/16
Amount of work Q can do in 1 day = 1/12
Amount of work P, Q and R can together do in 1 day = 1/4
Amount of work R can do in 1 day = 1/4 – (1/16 + 1/12) = 3/16 – 1/12 = 5/48
=> Hence R can do the job on 48/5 days = 9 (3/5) days

Correct Answer: A. 9(3/5) days

Last Updated: February 07, 2020