Question

Time calculation=

If it is noon at greenwich, calculate the local time of the places located on the following longtitude..

100 degree East

Answer 1

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

Step-by-step explanation:

Number of longitudes on Earth =
`360^(\circ)`

In one hour the Earth rotates
`15^(\circ)`

So,
`1^(\circ)` takes
`(60)/(15)=4\ \text{minutes}`

`100^(\circ)=4* 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}`.