Select the correct answer. The United States and the Soviet Union used the concept of rocket propulsion in combination with nuclear weapons during the Cold War. Which country had originally used rocket propulsion to its advantage during World War II? A. Japan B. China C. Germany D. France

answer: the time zones used to be whatever the local authority wanted them to be. one town might have 6am whenever the sun came up and another town had 6am 10 minutes later.  

the trains had a hard time when their orders said to be at a certain point at 6am.  

6am, but who's 6am.  

the railroads got together and set the time zones more or less along the longitude lines across the country.

explanation: