IBPS PO Prelims Model Paper 15

(1) Let the time taken by Anu and Bobby be x days and y days respectively
Since Bobby is 25% more efficient than Charu, therefore time taken by Charu =

5y

4

days
According to question,

1

y

+

4

5y

=

3

40

⇒ y = 24
Therefore, time taken by Charu =

5×24

4

=30‌days
and

1

x

+

1

24

=

7

72

⇒x=18
Therefore, work done by Anu and Charu together in 1 day
=

1

18

+

1

30

=

4

45

∴ Required time =

45

4

=11

1

4

‌days