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James and John had set their pocket watches to the
same time. Unknown to them, Johns watch was running
exactly two minutes per hour slow, and the watch
belonging to James was going exactly a minute per hour
too fast. Later, when they checked their watches again, it
was discovered that the watch belonging to James was
exactly one hour ahead of Johns watch.
How long had it been since they had originally set
their watches?

This case the difference btw Johns  and James watches is 3 min per hour. So it had been 60 min/3=20 hours  since they had set their watches

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