Question

3. When going east, do you add or subtract one hour for each time zone through which you travel?
4. When going west, do you add or subtract one hour for each time zone through which you travel?​

Answer 1

Answer:

Subtract one hour? No…you would set a clock ahead one hour for each 15° of longitude one passes through when heading east so as to largely keep in sync with local (read solar) time.

Explanation:

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Answer 2

Answer:

When going east one hour is added and while going west one hour is subtracted.