SSC CPO SI and ASI 2011 Paper

Question : 125 of 200

Marks: +1, -0

Pipes P and Q can fill a tank in 10 and 12 hours, respectively and C can empty it in 6 hours. If all the three are opened at 7 am, at what time will one- fourth of the tank be filled?

10 am
10 pm
11 pm
11 am

Validate

Solution:

(2) Part of tank filled in 1 hour when all three pipes are opened,

{1}/{10}+ {1}/{12}- {1}/{6}

= {6+5-10}/{60}= {1}/{60}

Therefore, the tank will be filled in 60 hours. One fourth of the tank will be filled in 15 hours. So one- fourth of the tank will be filled at 10 pm.

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