Pipes and Cisterns Practice Test 1 with solutions

Work done by A and B together in one minute
=

1

60

+

1

40

=

2+3

120

=

5

120

=

1

24

So, tank was scheduled to be filled in 24 minutes
⇒ Pipe B burst after 20 minutes.
So, part of tank filled in 20 minutes by A and B = 20 ×

5

120

=

5

6

Part of tank that remains empty =

1

6

Time taken by Pipe A to fill the tank = 60 minutes
Time taken by A to fill

1

6

th part of the tank = 60×

1

6

= 10 minutes
Total time taken to fill the tank = 20 + 10 = 30 minutes.