Marlboro Man on expressway

Algebra Level 3

As i was driving on the expressway at a steady clip, my wife said, " Have you noticed that those annoying signs for Marlboro cigarettes seem to be regularly spaced along the road? I wonder how far apart they are." My wife glanced at her wristwatch, then counted aloud the number of Marlboro man signs we passed in one minute. "What a coincidence," I exclaimed. "When you multiply that number by 10, it exactly equals the speed of our car in miles per hour." Assuming that the cars speed is constant, that the signs are equally spaced, and that my wife's minute began and ended with the car midway between two signs, how far is it between one sign and the next? (answer in miles)

The problem is not original.

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