Pipes and Cisterns Practice Test 3 with solutions

Question : 5 of 7

Marks: +1, -0

A cistern is connected with three pipes A, B and C. Pipes A and B can fill the cistern in 72 minutes, Pipes B and C can fill the cistern in 120 minutes, A and C can fill the cistern in 90 minutes. Together A, B and C can fill the cistern in:

40 minutes
42 minutes
50 minutes
60 minutes
30 minutes

Validate

Solution:

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

1/2(1/{72}+1/{120}+1/{90})

1/2({5+3+4}/{360})

1/2 × {12}/{360}

1/{60}

So, the all three will fill the cistern in 60 minutes.

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