February 19, 2017

Homework Help: word problem

Posted by Nicole on Thursday, March 5, 2009 at 12:27pm.

If steven can mix 20 drinks in 5 minutes, sue can mix 20 drinks in 10 minutes, and jack can mix 20 drinks in 15 minutes, how much time will it take all 3 of them working together to mix 20 drinks.

On this one I believe I would add 5+10+15 but what do I do after that?

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