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I knew that each watch was 3 minutes apart from each other after every hour.

So to be ten minutes apart, you times 3 times 3 hours. This equals 9 minutes with 1 minute left over.

The time we are at is 6 o clock plus 3 hours, which is 9 o clock.

If the clocks change 3 minutes in 1 hour, and an hour has 60 minutes, then 1 hour divided by 3 is 20 minutes.

So the time is 3 hours plus 20 minutes after 6 o clock.

This makes a time of 9:20 AM