Is Green Bigger Than Red, Step 1

Algebra Level 1

Bridge construction is in progress on Highway #6 in the Qu' Appelle Valley. There is room for single lane traffic past the construction area. In lieu of human traffic controllers red/green lights have been installed at each end of the area. The distance between the lights is 0.6 km and the speed limit is 60 km/h in this zone. If the duration of the red lights is 3.0 minutes which of the following is true?

A. Duration of the green lights is 3.0 minutes. (Type 1)

B. Duration of the green lights is less than 3.0 minutes.(Type 2)

C. Duration of the green lights is longer than 3.0 minutes.(Type 3)


The answer is 2.

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2 solutions

Michael Tang
Jul 26, 2014

Probably a better idea to put this as a multiple choice question ... you get 3 tries and there are three possible answers :P

Steven Perkins
Jun 10, 2014

Both lights must be red for a while to clear the traffic out. Then the light that wasn't green last time goes green while the other light stays red.

So the green light must be on less time than the red light.

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