Answers

2015-11-15T10:40:47+05:30
let the reservoir be filled by first pipe in x hours.
Then ,second pipe fill it in (x+10)hrs.
Therefore (1/x)+(1/x+10)=(1/12)
 (x+10+x)/(x(x+10))=(1/12).
x^2 –14x-120=0
(x-20)(x+6)=0
x=20 [neglecting the negative value of x]
so, the second pipe will take (20+10)hrs. (i.e) 30 hours to fill the reservoir



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