Pipes and Cisterns Practice Test 2 with solutions

Question : 13 of 40

Marks: +1, -0

Two pipes can fill a tank in 23 minutes and a 31 minutes respectively and together waste pipe can empty 5 cubic feet per minute. If all the 3 pipes are opened together, the tank can be filled in 23 minutes. Find the capacity of the tank?

190 cube feet
140 cube feet
137 cube feet
155 cube feet
Data inadequate

Validate

Solution:

Work done by third pipe alone
=

1/{23}-(1/{23}+1/{31})

1/{31}

So, time taken by the third pipe alone = 31 minutes
So, the capacity of tank = 31 × 5 = 155 cube feet.

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