Question

P can lay railway tracks between two stations in 16 days. q can do the same job in 12 days. with the help of r, they completes the job in 4 days. how much days does it take for r alone to complete the work?

Answer 1

☆☆ranshsangwan☆☆

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