Water is pouring into a tank at a constant rate. when the tank is full – InterviewSolution

InterviewSolution

1.	Water is pouring into a tank at a constant rate. when the tank is full, 10 pumps of equal capacity empty the tank in 12 hrs, while 15 pumps of the same capacity empty the tank in 6 hrs. The time which 25 pumps of the same capacity take to empty the tank, if the tank in initially full, will be :
Answer» Total work=12 hours. `10/x=1/y=1/12` `15/x=1/y=1/6`-(1) Subtracting equation 2 from 1 `5/x=1/6=1/12` `5/x=1/12` `-1/y=1/6-3/12` `=1/y=-1/12` `25/x=1/y=5/12-1/12=4/12=1/3` `1/x=1/3hours` `x=3 hours`

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