Question 1000296
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Let  D  be an unknown distance to Alton.


If Gina drives at  60 km/h,  she will spend  {{{D/60}}}  hours,  or  {{{(D/60)*60}}} = {{{D}}}  minutes to get Alton.


If Gina drives at  90 km/h,  she will spend  {{{D/90}}} hours,  or  {{{(D/90)*60}}} = {{{(2/3)*D}}}  minutes to get Alton.


According to the condition,  the difference of these times is  40  minutes.  It gives you an equation to determine  D:


{{{D}}} - {{{(2/3)*D}}} = {{{40}}}.


The solution is  D = 120 km.