SOLUTION: Two planes just took off from Milwaukee, WI. The first plane is traveling 3.5 times as fast as the second plane. After traveling in the same direction for 6 hours, they are 1620

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Question 1009451: Two planes just took off from Milwaukee, WI. The first plane is traveling 3.5 times as fast as the second plane. After traveling in the same direction for 6 hours, they are 1620 miles apart. What is the average speed of each plane? (Hint: Since they are traveling in the same direction, the distance between them will be the difference of their distances.)
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
D=Rt
.
.
D%5B1%5D=3.5R%2At
D%5B2%5D=R%2At
.
.
When t=6
D%5B1%5D-D%5B2%5D=1620
Substituting,
3.5R%286%29-R%286%29=1620
21R-6R=1620
15R=1620
R=108mph<--- Average speed of second plane
3.5R=378mph <--- Average speed of first plane