Syntel Company Numerical Ability Pipes and Cistern

A bucket contains z drops. and it leaks x drops in t secs.then the time required to empty the bucket (in minutes)

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Syntel Other Question

6 pipes fill or empty the cistern. find the number of emptying pipes if it takes 18hrs to fill and 18 hrs to empty. Maximum numbers that can be formed using all the 4 digits 6 4 8 1
without repetition and which is divisible by 9.