Discussion
What will be the time at 90° East when it is 12.00 noon at Greenwich Meridian ?
Answer: A
At 90° East it will be 6 PM.
Each degree of longitude is worth 4 minutes of time, and places east of Greenwich are ahead of it.
\[ \begin{aligned} 90 \times 4\ \text{min} &= 360\ \text{min} \\ &= 6\ \text{h ahead} \\ 12.00\ \text{noon} + 6\ \text{h} &= 6\ \text{PM} \end{aligned} \]
6 AM is what you get by going back 6 hours, which is the time at 90° West. 7 PM and 9 PM correspond to 105° E and 135° E.
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