Question:Ten pipes through which water flows at the same rate can fill a tank in `28` minutes. If three pipes go out of order, how long will the remaining pipes take to fill the tank ? 

A `40` min 
B `8` min `24` sec 
C `25` min `12` sec 
D `32` min `36` sec 

+ Answer
A 

+ Explanation
Less pipes, more time (Indirect)

`:. 7 : 10 :: 28 : x` or

`7x = 10 xx 28` or

`x = (10 xx 28)/7`

`= 40`.

`:.`Remaining pipes will fill the tank in `40`min.

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Md. Habib Ullah

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