<PRE><B>Question 1140052</B>
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Adrian drove 40 miles at a certain speed. Adrian drives another 40 miles on the second part of the trip at a speed 5 mph faster. Driving time for the entire trip was 77 mins. Find the rate at which Adrian drove during the first part of the trip.
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{{{RT=D}}}
rate R
time T
distance D


77 minutes is same as  {{{77/60}}}{{{hours}}}.
&lt;pre&gt;
                 SPEED              TIME           DISTANCE
firstpart         r                 40/r              40
secondpart       r+5                40/(r+5)          40
TOTAL                               77/60
&lt;/pre&gt;
That analysis of the problem description should help you, and you can now continue.</PRE>