Syntel Company Numerical Ability Time and Work

There is a leak in the bottom of a cistern. when the cistern is in through repair, it would be filled in 4 1/2 hours. if now takes half an hour longer. if the cistern is null, how would long the leak take to empty the cistern?
[A] 40 h
[C] 12 h
[B] 36 h
[D] 34 h

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Syntel Other Question
A water tank can be filled by pipe P alone in 30 mins and by pipe Q alone in 20 mins the same tank can be emptied by pipe R in 25 mins. if all the 3 pipes are opened at the same time, how long will it take to fill the water tank?
[A] 12.12 mins
[C] 22.10 mins
[B] 23.08 mins
[D] 30.15 mins A cistern is normally filled in 6hours but takes two hours longer to fill because of a leak its bottom. if the cistern is null the leak will empty it in
[A] 16 h
[C] 18 h
[B] 17 h
[D] 24 h