IBPS RRB Officer Prelims 09 Sep 2017 Shift 1 Paper

(3) A completes 1 work in 15days.
B is 50% more efficient thanA.
∴Time taken by B =

100

150

×15= 10 days
A and B together completed

2

3

of work.
(A + B)’s 1 day’s work
=

1

15

+

1

10

=

2+3

30

=

5

30

=

1

6

∴Time taken by A and B indoing

2

3

rd work =

2

3

×6= 4 days
∴A and B worked together for4 days.