A water filling Pipe P is 5 times faster than second Pipe Q. If P fills a cistern in 30 minutes. How long will it take to fill the tank, when both the pipes are kept in operation simultaneous?

A water filling Pipe P is 5 times faster than second Pipe Q. If P fills a cistern in 30 minutes. How long will it take to fill the tank, when both the pipes are kept in operation simultaneous?
1). 27 min
2). 26 min
3). 28 min
4). 25 min

Given,

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⇒ P = 5Q

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Pipe P 1 minute work = 1/30

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Pipe Q’s 1 minute work = 1 /150 

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If both pipes open,

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Pipe (P + Q)’s 1 minute work = 1/30 + 1/150

\n\n

= 6/150

\n\n

= 1/25

\n∴ It will take 25 minute to fill the tank.

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