Pipes and Cisterns Practice Test 1 with solutions

Part of cistern filled by A and B in 10 minutes
= (

1

15

−

1

20

) × 10 = (

4−3

60

) × 10 =

1

6

Remaining portion that is to be filled = 1 -

1

6

=

5

6

Part of cistern filled by A and C in 1 minute
=

1

15

+

1

10

=

2+3

30

=

1

6

Time taken to fill

1

6

th part the of cistern = 1 minute
Time taken to fill

5

6

th part of the cistern = 1 × 5 = 5 minutes