Question 1125043
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The "time" equation is


    {{{60/r}}} + {{{92/(r+16)}}} = 4  hours


saying that the total time is the sum of the partial times.


You can reduce it to a quadratic equation and solve it.


But you also can use the "trial and error" method, which will quickly (in seconds) give you an


<U>Answer</U>.   r = 30 mph is the slow rate.
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Even if it is not legal in your class to solve using this method, it will help you to use the factoring method while solving the quadratic equation.