A Math Problem

Soemthing I need to work on a bit, but when I get around to changing the National Educational Standards — and No Child Will Be Left Behind–, I will include this puzzle in its most well-thought out form.

2 automobiles are heading in the same direction in different lanes of a 1 way street. The start of one car is 3 feet ahead of the start of the other car. Each red traffic light starts three seconds behind the last traffic light and lasts a full minute. The first green traffic light, the one that moved the cars to be separated by 3 feet, and assuming the response times to the yellow light are identical, how many red traffic lights will it take before the two cars gain further separation?

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