Question

Why is it 5:30 pm in India and 12:00 noon in London?

Answer 1

It is 5:30PM in India when it is 12:00 noon in London because of the following reasons:
- London is located at $0^{\circ }$ longitude while the time of $82{\frac{1}{2}}^{\circ }$E longitude is taken as Standard Time in India.
- There is a difference of $82{\frac{1}{2}}^{\circ }$ between the longitude of London and the Standard Meridian of India $\left(82{\frac{1}{2}}^{\circ }\text{E}\right)$.
- Time in India is ahead of London. It is 4 minutes ahead at every longitude towards the East.
- Hence, time in India is ahead of London by 5:30 hours $(4\times 82\frac{1}{2}=330\text{minutes or 5:30 hours)}$.