SOLUTION: if you get 18 miles ahead of someone after 3 hours, whats your speed?

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Question 555536: if you get 18 miles ahead of someone after 3 hours, whats your speed?
Answer by richard1234(7193) About Me  (Show Source):
You can put this solution on YOUR website!
Can't determine the speed. You can say that your speed is 6 mph faster than the other person's speed (so if he is still, you are going 6 mph).