IBPS Clerk Prelims Model Paper 23

Let time taken by A = x days
Let time taken by B = y days
30 ×

1

50

+ 30 ×

1

x

= 1
x = 75 days; x is the time taken by A alone to do the work.
Also,

1

x

+

1

y

=

1

50

⇒ y = 150 days; y is the time taken by B alone to do the work.