I have two watches with a 12 hour cyc...

I have two watches with a 12 hour cycle. One of them gains one minute a day and the other loses `1 1/2` minutes per day. If I set them both at the correct time, how long will it be before they again tell the correct time together? (a) 288 days (b) 480 days (c) 720 days (d) 1440 days

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