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

A monkey climbs 6 mts and falls 3mts in alternate minutes.Then
time taken to climb a tree 60metres high?
Find the largest no: which is a factor of 1080 and 729