SOLUTION: it takes bob 10 hours to clean. it takes bill 7 hours to clean. How long does it take if they work together?

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Question 911633: it takes bob 10 hours to clean. it takes bill 7 hours to clean. How long does it take if they work together?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
1%2F10+%2B+1%2F7+=+1%2Fx
7x + 10x = 70
17x = 70
x = 70/17 = ~4.12hrs