1.

One pipe P is 4 times faster than pipe Q and takes 45 minutes less than pipe Q. In what time the cistern is full if both the pipes are opened together?

Answer»

8 minutes
10 minutes
12 minutes
14 minutes

Solution :LET P takes X minutes to fill the tank alone, then Q will
take 4x minutes to fill the tank
`4x-x+45, x=15`
So P will take 15 minutes and Q will take 60 minutes to
fill the tank. Both will fill the tank in
`(60xx15)/75 = 12` minutes


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