Extension: LCM 3 Three lights, red, yellow and green, are controlled by switches.  At the start, the three lights are switched on simultaneously.  The.

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Extension: LCM 3 Three lights, red, yellow and green, are controlled by switches.  At the start, the three lights are switched on simultaneously.  The red light stays on for 2 seconds, then is switched off for 2 seconds, and the pattern repeats.  The yellow light is on for 4 seconds, off for 4 seconds.  The green light is on for 3 seconds, off for 3 seconds. The three lights are switched on and off in their respective patterns for 15 minutes.  Determine the total time, in minutes and seconds, that exactly two lights are on.