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Pipes and Cisterns Practice Test 2 with solutions
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© examsnet.com
Question : 2
Total: 40
An inlet pipe A and waste pipe B connected to a tank individually takes 9 and 15 minutes respectively to fill the tank. Find the fraction of tank that remains empty after they both have worked together for 18 minutes.
6
7
1
9
4
9
1
5
None of these
Validate
Solution:
Part of tank filled by A and B together in 1 minute =
1
9
−
1
15
=
5
−
3
45
=
2
45
Part of tank filled by A and B in 18 minutes
=
18
×
2
45
=
4
5
Part of tank that remains empty after 18 minutes
=
1
−
4
5
=
1
5
© examsnet.com
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