Question 1151746
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After traveling for 40 minutes, Mr. Koole had to slow to 2/3 his original speed for the rest of the trip due to heavy traffic. The total trip of 84 miles took 2 hours. 
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<pre>
SPEED          TIME hours        DISTANCE

r               2/3             (2/3)r            

(2/3)r          2-2/3=4/3       (2/3)(4/3)r

TOTALS           2                84
</pre>
{{{cross((2/3)r+(4/3)r=84)}}}

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