Pipes and Cisterns Practice Test 2 with solutions

Question : 2 of 40

Marks: +1, -0

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

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