If it is 6:00 AM at 30° East longitude, what time is it at 120° West longitude?

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Question: If it is 6:00 AM at 30° East longitude, what time is it at 120° West longitude? (2022)

Options:

Correct Answer: 10:00 PM

Exam Year: 2022

Solution:

The time difference is 30 + 120 = 150 degrees. 150/15 = 10 hours. So, 6:00 AM - 10 hours = 8:00 PM previous day.

If it is 6:00 AM at 30° East longitude, what time is it at 120° West longitude? (2022)

If it is 6:00 AM at 30° East longitude, what time is it at 120° West longitude? (2022)

Step 1: Identify the time at 30° East longitude, which is 6:00 AM.
Step 2: Calculate the total degrees of longitude between 30° East and 120° West. This is done by adding the two longitudes: 30 + 120 = 150 degrees.
Step 3: Determine the time difference in hours. Since the Earth rotates 15 degrees per hour, divide the total degrees by 15: 150 / 15 = 10 hours.
Step 4: Since 120° West is to the west of 30° East, subtract the time difference from 6:00 AM. So, 6:00 AM - 10 hours = 8:00 PM the previous day.

Time Zones – Understanding how time changes with longitude, where each 15 degrees of longitude corresponds to a one-hour difference in time.
Longitude Calculation – Calculating the time difference based on the degrees of longitude between two locations.