How long does it take Sally in hours, working alone, to paint one room?

Question

It takes Henry 8 hours longer to paint one room than it does Sally. If they work together Sally and Henry can paint one room in 3 hours. How long does it take Sally in hours, working alone, to paint one room? (Enter an exact number.)

Answer 1

S represents Sally's time alone

S + 8 represents Henry's time alone

 

(3 / S)  + (3 / (S + 8)) = 1

 

Can you solve for S and answer?