IBPS Clerk Prelims Model Paper 21

Part of tank filled by A and B in 2 hours =

2

6

=

1

3

So in 8 hours, part of the tank filled by A = 1 -

1

3

=

2

3

In 1 hour, part filled by A =

2

(3×8)

=

1

12

Now, let B take X hours to fill the tank.
So, (

1

12

)+(

1

X

) =

1

6

X = 12 hours