Сделать это 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?

This case the difference btw  john's   and  james  watches is 3 min per hour. so it had been  60 min/3=20 hours   since they had set their watches

As you can see from this postcard, i (1) have (arrived) safely. paul and i (2) have (already/done) lots of things even though i (/be) in new yourk twenty four hours. i(4). have (not slept) for two days! i (5) have (visited) the museum of modern art, i (6)  have (seen) a movie and i (7) have (eaten) a real american breakfast. i (8) have .(riden)in a yellow cab and i (9) have (travelled) on the subway too. i (10) have . (not/spent) any money yet because i (11) have (not/cashed) any of my traveller's cheques. paul(12) has (paid) for everything so far.i send you another card when i( had) some sleep

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