Asked by Jay
                Stephanie can clean a pool in 1 hour , and Mark can clean the same pool in 1.5 hours. If the rate at which they work together is the sum of their rates working separately, how many minutes should they need to clean the pool if they work together? (1 hr=60 min)
            
            
        Answers
                    Answered by
            Marth
            
    Stephanie cleans at the rate of 1 pools/hr.
Mark cleans at the rate of 1/1.5, or 2/3 pools/hr.
Their combined rate is 5/3 pools/hr
If r is the rate, t is time, and p is the number of pools, then
r = p/t
(5/3pools/hr) = (1 pool)/t
t = 3/5hr
t = 60*3/5 = 36min
    
Mark cleans at the rate of 1/1.5, or 2/3 pools/hr.
Their combined rate is 5/3 pools/hr
If r is the rate, t is time, and p is the number of pools, then
r = p/t
(5/3pools/hr) = (1 pool)/t
t = 3/5hr
t = 60*3/5 = 36min
                    Answered by
            Henry
            
    T = t1*t2/(t1+t2) = 1*1.5/(1+1.5) = 0.6h. = 36 Min.
    
                    Answered by
            Steven 
            
    36 is the correct answer.
    
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