easy · GMAT Quantitative Reasoning
A security light flashes every 12 minutes, and a second light flashes every 18 minutes. Both lights flash together at 6:00 PM.
At what time will the two lights next flash at the same moment?
- 7:00 PM
- 6:30 PM
- 6:24 PM
- 6:54 PM
- 6:36 PM
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