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

Question

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

stamp · Answer

$$Ryan=\frac{5\ hours}{1\ hole}$$$$Castel=\frac{6\ hours}{1\ hole}$$Does this help you find an approach? What answer do you obtain for t hours?

anonymous · Answer

All I see is dividing their time by the number of holes, (1 hole) and that would still be the number I started with. So I still don't understand.

stamp · Answer

$$Ryan+Castel=\frac{5\ hours}{1\ hole}+\frac{6\ hours}{1\ hole}$$$$=\frac{11\ hours}{2\ holes}=6.5\ hours$$I will leave it to you to check the answer

anonymous · Answer

Oh, okay. Now I get it. Thank you :)