Plz help me solve this

Question

Jim and Kim can paint a fence in 144 minutes. (This assumes that both work the whole time and that each works at a constant pace.) Jim working alone could paint the whole fence in two hours less than it would take Kim working alone to paint the whole fence. How long would it take Kim working alone to paint the whole fence?

Answer 1

K represents the time Kim needs

K - 2 represents the time Jim needs

 

(2.4 / K) + 2.4 / (K -2) = 1         144 minutes is 2.4 hours

 

Can you solve for K and answer?