SOLUTION: Bobby and Ricky are in a 10 lap race on a 1-mile oval track. Bobby averaging 90mph, has completed 2 laps just as Ricky gets his car on the track. What speed does rick have to avera

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Question 70253This question is from textbook
: Bobby and Ricky are in a 10 lap race on a 1-mile oval track. Bobby averaging 90mph, has completed 2 laps just as Ricky gets his car on the track. What speed does rick have to average to be even with Bobby at the end of the 10th lap. This question is from textbook

Found 2 solutions by ankor@dixie-net.com, JoelSchwartz:
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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Bobby and Ricky are in a 10 lap race on a 1-mile oval track. Bobby averaging 90mph, has completed 2 laps just as Ricky gets his car on the track. What speed does rick have to average to be even with Bobby at the end of the 10th lap.
:
We can simplify this by saying what speed will Ricky have to go to cover 10 mi
while Bobby covers 8 miles?
:
Let s = Ricky's speed
T = dist/speed
:
8/90 = 10/s
Cross multiply
8s = 900
s = 900/8
s = 112.5 mph to overtake Bobby on completion of the 10th lap

Answer by JoelSchwartz(130) About Me  (Show Source):