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I think the answer would be 12.5

@yashiii you there?

yup....i think i solved it incorrectly .my ans was 8 ..hehhe

Oh ok, i have to go. Good luck solving the problem. sorry

bye :) @vanessaperezxo

a similar approach is to solve \[10(2x+3y)=1\\
8(3x+2y)=1\] which is not that elegant but works

actually i want correct ans...those ans options were imaginary .:(

how did you guess at the correct answer of 12.5?

now i got ans 13.5 , so any one can pls tell me the accurate ans

12.5 is correct

we can do it step by step, although i guess there probably a better method than i used

put men's rate as x, boys at y
the first two statements translates as \[10(2x+3y)=1\\
8(3x+2y)=1\]

solving this for x and y gives \[x=\frac{7}{200},y=\frac{1}{100}\]

@Michele_Laino , you have ne idea

acha..okay..got it now :)

oops i means solve \[T\left(\frac{14}{200}+\frac{1}{100}\right)=1\]

and that gives \(T=12.5\)

okay

I agree with @satellite73 we have to solve that system above, so we can find the requested time

like i said, there may be a snappier way to do it, i don't know it

@satellite73 , @Michele_Laino , thankyou so much both of you :)