RRB Assistant Loco Pilot and Technician Model Paper 16 with key

Question : 53 of 75

Marks: +1, -0

A and B can do a piece of work in 15 days. B and C can do the same work in 10 days and A and C can do the same in 12 days. Time taken by A, B and C together to do the job is:

8 days
4 days
9 days
5 days

Validate

Solution:

Time taken by A, B, C together =

1/2[1/{15}+1/{10}+1/{12}]

1/2[{15}/{60}]

= 8 days

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