Question

Pipe a can fill a tank in 10 hours . Due to a leak at the bottom , it takes 15 hours for the pipe a to fill the tank . In what time can the leak alone empty the full tank ?

Answer 1

Time to fill a tank is 1/10 hrs
With leak 1/15 Hrs
New fill time is 15 hrs.
Therefore time to empty the tank with leak is 15-1/10
i.e 14.9 Hrs