1.

Two pipes P_(1) " and " P_(2) can filla tank in 8 h and 5 h, respectively. They are opened together, after an hour, pipe P_(2) is closed, in how many more hours will the tank be filled?

Answer»

`(27)/(5)h`
`(27)/(2)h`
`(23)/(5)h`
`(28)/(5)h`

Solution :In 1 h, 1/8 + 1/5 = (13/40)th of the tank gets FILLED.
`therefore1-(13)/(40) = (27)/(40)` part of the tank is still empty.
`THEREFORE (27)/(40)` part of the tank can be filled in= `(8 XX 27)/(40) = (27)/(5)`h.
Hence, the correct option is (a).


Discussion

No Comment Found

Related InterviewSolutions