SOLUTION: Rob can tar a roof in nine hours. One day hsi friend Kayla helped him and it only took 4.74 hours. How long would it take Kayla to do it alone?

Question 143342: Rob can tar a roof in nine hours. One day hsi friend Kayla helped him and it only took 4.74 hours. How long would it take Kayla to do it alone?
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
Rob can tar a roof in nine hours. One day his friend Kayla helped him and it only took 4.74 hours. How long would it take Kayla to do it alone
:
Let t = K's time alone
Let the completed job = 1
:
+ = 1
:
Multiply equation by 9t and solve for t. (just like problem 143346)
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