Question 1201064
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Al and Bev traveled from their apartment to a picnic 20mi away. Al traveled on his bike while Bev, who left later, took her car. Al's average rate was half of Bev's average rate. The trip took Al a half hr longer than Bev. What was Bev's average rate?
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<pre>
                 SPEED        TIME in hour    DISTANCE

AL (bike)           r         20/r             20

BEV (car)          2r        20/(2r)           20

DIFFERENCE                   {{{1/2}}}
</pre>
Can you understand how to solve with the displayed information? 
Do you really need to use two variables instead of the one?


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r is 20, so 2r is 40 miles per hour.