SBI PO 10 July 2016 Paper

C is 20% more efficient thanA.
∴ Time taken by A = 6x days
Time taken by C = 5x days
(A + B)’s 1 day’s work =

1

16

... (i)
(B + C)’s 1 day’s work =

1

15

... (ii)
∴ By equation (ii) – (i),
(C – A)’s 1 day’s work
=

1

15

−

1

16

∴

1

5x

−

1

6x

=

1

15

−

1

16

⇒

6−5

30x

=

16−15

240

⇒ 30x = 240
⇒ 6x =

240

30

× 6 = 48
= Time taken by A