SOLUTION: Working alone, Ryan can dig a 10ft. by 10 ft. hole in five hours. Castel can dig the same hole in six hours. How long would it take them if they worked together?

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Question 670594: Working alone, Ryan can dig a 10ft. by 10 ft. hole in five hours. Castel can dig the same hole in six hours. How long would it take them if they worked together?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

How longhighlight%28x%29 would it take them if they worked together?

Working together:  PER hr KEY

 1%2F5+%2B+1%2F6+=+1%2Fx

     6x + 5x = 30

       11x = 30hr

         x = 2.7 hr   (rounded to the nearest tenth)