This didn’t really happen, but imagine it. The only clock in my house is one of those grandfather types, with hands and a pendulum, and you have to wind it up. So I got up in the morning, and the clock was stopped. I forgot to wind it. I needed to set the correct time.
My friend Bill lives about five blocks away, and he always has the correct time, but no telephone. I walked over to Bill’s house and talked to him for some time. Then I walked back home and set my clock to very close to the correct time. I walked at the same rate the whole trip, but I have no idea how fast I walked.
How was I able to set my clock so accurately?
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Update and Answer
People provided answers to the Facebook posting, but nobody commented one the blog site. Anyhow, here is my answer.
Before I left the house I wound my clock and set the time to noon. Then I walked to Bill’s house and noted the time I arrived and the time I left. When I got home I noted how much time had elapsed on my clock, and computation of the current time was straightforward.