A tank can be filled with water by two pipes P and Q together in 36 minutes

A tank can be filled with water by two pipes P and Q together in 36 minutes. If the pipe Q is stopped after 30 minutes, the tank is filled in 40 minutes. The pipe Q can alone fill the tank in time
(a) 60 minutes
(b) 70 minutes
(c) 90 minutes
(d) 100 minutes

Anurag Mishra Professor Asked on 31st March 2016 in Maths.
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    Answer: (c) 90 minutes 

    Anurag Mishra Professor Answered on 10th May 2016.
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