Is there an easier way to get the answer?
I can get the formula. But when I find the root it really takes too much time. How do i solve this in 2 min?
Should I back solve by dividing all the answers by 2?
Answer Choice is 12.
For Time and Work problems, If A takes x hrs to do a work and B takes y hours to do a work they combindly do the work in n hrs
Formula is => 1/x+1/y = 1/n
Here Tom takes x hrs to type 20 pages
So Jack takes (x+2) hrs to type 20 pages
So Tom takes 5x/4 to type 25 Pages => Jack takes 5(x+2)/4 hrs to type 25 pags
They both completed typing in 3 hrs, accoring to above formula (1/(5x/4)) +(1/(5(x+2)/4)) = 1/3
This leads to an equation 5x^2-14x-24 = 0 Since x cannot be less than zero x =4
x = Time taken by Tom to type 20 pages. So Jack takes 6 hrs to type 20 pages => Jack takes 12 hrs to type 40 pages.