Question

Suppose there are two places X and Y, located at 30° E and 30° W longitudes respectively. The time at Prime Meridian is 12 noon. What
s the local time at X?​

Answer 1

Answer:

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Explanation:

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Answer 2

Answer:

The local time at place X = 2:00 pm

Concept:

Rotation and time zones. Earth takes 24 hours to complete one rotation i.e., to cross 360° longitudes.

360° = 24 hrs. = 24 × 60 mins.

360° = 1440 minutes

1° = 1440/360 minutes

1° = 4 minutes

∴ Earth takes 4 minutes to move 1° longitude.

Given:

Time at Prime Meridian (0° longitude) = 12 noon

Location of place X = 30°E of Prime Meridian

Location of place Y = 30°W of Prime Meridian

Find:

Local time at X.

Solution:

The time increases at a rate of 4 minutes per one degree of longitude, east of the Prime Meridian.

∴ Difference between Prime Meridian and X = 30° of longitudes

Total time difference = 30 × 4 minutes

                                   = 120 minutes

                                   = 120/60 hours

                                    = 2 hours

Local time of place X is 6 hours more than that of Prime Meridian.

Hence, Local time at place X = 2:00 pm

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