Question

One absentminded ancient philosopher forgot to wind up his big clock hanging on the wall in the house. he had no radio, tv, telephone, internet, or any other means for telling time. so he traveled on foot to his friend's place few miles down the straight desert road. he stayed at his friend's house for the night and when he came back home, he knew how to set his clock. how did he know?

Answer 1

HE LOOKED AT HIS FRIEND'S WATCH.

I can also be wrong but might it could be the answer.