Two towns, A and B, are connected by a straight road that is 15 miles long. Travelling from town A to town B, the speed limit changes every 5 miles: from 25 to 40 to 20 miles per hour. Two cars, one at town A and one at town B, start moving toward each other at the same time. They drive at exactly the speed limit in each portion of the road. How far from town A, in miles, will the two cars meet?
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