Question 95544
The distance (in miles) traveled when driving at a certain speed (s) for "x" hours, then driving "y" miles/hour faster for another hour.
Express the distance in terms of s.
the distance traveled when driving "a" mph for "x" hours is the expression __ax_____. 
ADDED to that distance is driving 1 hour at "y" mph FASTER, 
so the expression to be added is____1y_______ . 

The final answer (expression) then is  ax+y___________.

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Your posting was very confusing because you left out some
of the required data.  Please review your entry carefully.
I inserted the "x" and the "y".  Hope that helps you with
the problem.
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Cheers,
Stan H.