Question

Time calculation=

Answer 1

Answer:

$18:40$ or $6:40\ \text{PM}$

Explanation:

Number of longitudes on Earth = $360^{\circ}$

In one hour the Earth rotates $15^{\circ}$

So, $1^{\circ}$ takes $\dfrac{60}{15}=4\ \text{minutes}$

$100^{\circ}=4\times 100=400\ \text{minutes}\\ =6\ \text{hours and }40\ \text{minutes}$

Since the longitude is in the East the time difference will be added.

So, if it is noon in Greenwich the time at 100 degree East will be $(12+6:40)=18:40$ or $6:40\ \text{PM}$.