Pipes and Cisterns Practice Test 1 with solutions

Question : 15 of 40

Marks: +1, -0

Three pipes A, B and C are attached to a cistern where A and B are inlet pipes and C is a waste pipe. Time taken by A, B and C individually to fill the cistern is 11, 10 and 15 minutes respectively. Find the approximate time taken by all of them together to fill the cistern.

11 minutes
9 minutes
7 minutes
8 minutes
None of these

Validate

Solution:

Part of cistern filled in 1 minute
=

1/{11}+1/{10}-1/{15}

{30+33-22}/{330}

{41}/{330}

So, time taken by them =

{330}/{41}

8 2/{41}

minutes
= 9 minutes

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