RBI Assistant Prelims 2015 Sitting 2 Paper

C is 20% more efficient than A.
Time taken by A = 6x days
Time taken by C = 5x days
(A + B)'s day's work =

1

16

...(i)
(B+C)'s 1 day's work =

1

15

...(ii)
By equation (ii) - (i),
(C-A)'s1 day's work =

1

15

−

1

16

1

5x

−

1

6x

=

1

15

−

1

16

⇒

6−5

30x

=

16−15

240

⇒30x=240⇒x=8
Time taken by A =6x=6×8=48