While on a straight road, car X and car Y are traveling at different constant rates. If car X is now 1 mile ahead of car Y, how many minutes from now will car X be 2 miles ahead of car Y?
i) Car X is traveling at 50 miles per hour and car Y is traveling at 40 miles per hour.
ii) Three minutes ago car X was 1/2 mile ahead of car Y.
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发表于 2009-3-10 21:29:00
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