ПОМОГИТЕ С ЗАДАНИЕМ! James and John had set their pocket watches to the same time. Unknown to them, John's watch was running exactly…

ПОМОГИТЕ С ЗАДАНИЕМ! James and John had set their pocket watches to the same time. Unknown to them, John's 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 John's watch. How long had it been since they had originally set their watches?