Discussion
If Greenwich Meridian Time is 12 noon, then what will be the time at 45° East longitude ?
Answer: B
The time at 45° E is 3 p.m.
The Earth turns 360° in 24 hours, so local time changes by 4 minutes for each degree of longitude, and places east of Greenwich are ahead of it.
\[ \begin{aligned} 45 \times 4 &= 180 \text{ minutes} = 3 \text{ hours} \\ 12 \text{ noon} + 3 \text{ h} &= 3 \text{ p.m.} \end{aligned} \]
9 a.m. is the result of subtracting the 3 hours, which would be right for 45° W. 10 a.m. and 2 p.m. are 2 hours either way, which comes from using the wrong rate of change.
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