RRB Assistant Loco Pilot and Technician Model Paper 7 with solutions

Question : 12 of 100

Marks: +1, -0

If A and B together can complete a piece of work in 15 days and B alone in 20 days, in how many days can A alone complete the work ?

Solution:

(a) (A + B)’s 1 day’s work =

1/15

B’s 1 day’s work =

1/20

∴ A’s 1 day’s work
=

1/15-1/20

{4-3}/60=1/60

∴ A alone will do the work in 60 days.

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