1.

A cistern is fille in 8 hours and it takes 12 hours when there is a leak in its bottom. If the cistern is full, in what time shall the leak empty it?

Answer»

24 HOURS



work DONE by 1 hour by FILLING pipe = 1/8
work done by 1 hour by the LEAK and the filling pipe =1/12
work done by 1 hour by the leak = 1/8 – 1/12 =1/24
Hence the leak can empty it in 24 hours. 



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