<PRE><B>Question 294817</B>
 Two planes just took off from St. Louis, MO. The first plane is traveling 2 times faster than the second plane. After traveling in the same direction for 4.5 hours, they are 468 miles apart. What is the average speed of each plane?
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The difference is speed is 468/4.5 = 104  mph.
2 times faster is 3 times as fast.
r1 = 3r2
r1 - r1/3 = 104
2r1 = 312
r1 = 156 mph
r2 = 52 mph
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