Question 965418
Bob paints 1 house in 6 hours or 1house/6hrs=1/6 house/hr=1.67 house/hr
In 3.5 hours he paints (3.5hrs)(1.67 house/hr)=0.583 house, so in 3.5 hours,
John painted the rest or 1-0.583=0.417 of the house.
So John paints (0.417 house)/3.5 hours=0.119 house/hr and to paint the whole house:
(1 house)/(0.119 house/hr)=8.4 hours
ANSWER: It would take John 8.4 hours to paint the house alone.