David and Dan are planing to paint a house together.John thinks that if he worked alone,it would take him 3 times as long as it would take Joe to paint the entire house.Working together,they can complete the job in 24 hours.

6.What is the time it takes for Dan to complete the job?
A. x
B. 3x
C. 1/x
D. 1/3x
7.What is the work rate of David?
A. 3x
B. 1/3x
C. 1/x
D. 1/x + 1/3x
8.How long would it take David to bcomplete the job alone?
A. 32 hours
B. 96 hours
C. 72 hours
D. 24 hours
9.What is the correct rational algebraic equation that can represent both Joe and John working together?
A. 1/x + 1/24=1/3x
B. 1/3x - 1/x=.1/24
C. 1/x + 1/3x=x/24
D. 1/x + 1/3x=1/24​