If it is 10pm at 45 degrees west. what time will it be at 90 degrees

If it is 10 pm at 45 degrees west, then it will be 7 pm at 90 degrees west.

Explanation:

atThe world is divided into 24-hour zones. The hour zones are set in accordance with the latitudinal lines. Each latitudianl line is 15 degrees apart from the neighboring ones, meaning that there is one hour difference every 15 degrees. The prime meridian is set as a zero zone, so everything east of it is counted with +, while everything west of it is counted with - when it comes to the hours.

If we have a situation where the time is 10 pm at 45 degrees west, then it will be very easy to know what the time is at 90 degrees west. There are 45 degrees between the two, and we have 15 three times in 45, thus we have a difference of three hours. Since 90 degrees west is west of 45 degrees west, we have counting with -, thus -3 hours, so the time will be 7 pm.