Question 1158942
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The "time" equation is


    {{{120/(r-4)}}} - {{{120/r}}} = 5 hours longer.


Reduce it to a quadratic equation and solve it formally.


Or guess the answer mentally:  r = 12 miles per hour.    <U>ANSWER</U>


<U>CHECK</U>.  {{{120/(12-4))}}} - {{{120/12}}} = {{{120/8}}} - {{{120/12}}} = 15 - 10 = 5 hours.   ! Correct !
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Solved/explained/answered.


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Please refer to the problem ID number 1158942.