Question:If `3/5` of a cistern is filled in `1` minute, how much more time will be required to fill the rest of it ? 

A `30` sec 
B `40` sec 
C `36` sec 
D `24` sec 

+ Answer
B 

+ Explanation
Remaining part 

`= (1 - 3/5)`

`= 2/5`.

Less part, less time (Direct)

`3/5 : 2/5 :: 60 : x`or

`3/5 x = 2/5 xx 60` or

`x = 40` sec.

`:.`Rest of the cistern will be filled in `40` sec.

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Md. Habib Ullah

Editor, VCampus

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