John and Mary drive from Westville to Eastville. John drives the first 40 miles, and Mary drives the rest of the way. That afternoon they return by the same route, with John driving the first leg and Mary driving the last 50 miles. Who drives the farthest, and by what distance?
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We don’t know the distance between Westville and Eastville, but suppose it’s only 50 miles. In that case John drives 40 miles altogether and Mary drives 60. If the distance is any greater than that, then the two drivers are dividing the extra miles equally between them, with Mary driving east and John west. So the total distance is immaterial — Mary drives 20 more miles than John.