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Discussion Starter #1
Three ships sailed from New York to Southampton on the same day. The first ship did the round trip back to New York in 12 days the second ship in 16 days and the third ship in 20 days, turn around time for each ship in each port was 12 hrs, the ships were always back at sea on the same day they arrived. How many day will pass before all three ships again leave New York on the same day and how many round trips will each ship make in the meantime?
 

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Discussion Starter #3
Well done Bruce, I had hoped it would take a little longer than 8 minutes, must throw my puzzle book away.
 
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