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8:01 PM.

After 60 seconds . . .

Light #1 flashes (60/20) = 3 more times: 8:00:20, 8:00:40, and 8:01.

Light #2 flashes (60/30) = 2 more times: 8:00:30 and 8:01.

They coincide at 8:01.

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