SSC CHSL 9-Jan-2017 Shift 3 Paper

Let total work to be done = 56 units
Pradeep has done 1/4 of a job i.e.

56

4

=14 units in 14 days
⇒ Pradeep's efficiency =

14

14

=1 unit/day
Work left = 56 - 14 = 42 units which is done by Saquib in 56 days
⇒ Saqub's efficiency =

42

56

=0.75 units/day
Pradeep and Saquib 1 day's work = 1 + 0.75 = 1.75 units/day
∴ Time taken by them together to complete the work =

56

1.75

=32 days