Asked by Natalia
                Richard takes 35 minutes to mow a lawn, but with the help of his friend Joe it only took him 15 minutes. If Joe worked alone, how long would it take Joe to mow the same lawn?
            
            
        Answers
                    Answered by
            Steve
            
    If it takes Joe x minutes alone, then
1/35 + 1/x = 1/15
    
1/35 + 1/x = 1/15
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