How many degrees are in each time zone and what is the longitude of Philadelphia?

Question

This is from Chapter 4, Exercise 4-3, #35 of Fundamentals of Technical Mathematics (2nd edition): Longitude is measured 0 degrees (the longitude of London on the Greenwich meridian) traveling west parallel to the equator. There are 24 one-hour time zones. (a) How many degrees are in each time zone? (b) If the sun rises exactly 5 hours later in Philadelphia than in London, what is the longitude of Philadelphia?

Answer 1

1) Depend s on the timezone. Some 'degrees' can have more then one timezone. Math is simple (360 degrees divided by 24 hours = 15 degrees)

2) 5 hour away means it is 5 times 15 degrees = 75
(Coordinates: 39°57′12″N 75°10′12″W)

Answer 2

Each time zone would vary because the "timeline" zone usually goes around different countries to make sure one whole country/state is part of a time zone. Like in the US, the border between the Pacific Time Zone& Mountain is a border down the line of Idaho, Nevada, Arizona.
However, each time zone should be around 15 degrees apart.
Philadelphia coordinates are: 39°57'12" N 75°10'12" W
Longitudes run from UP to DOWN, north to south, so they are measured by east&west. Therefore, Philadelphia's longitude would be around 75° W.

Answer 3

In reality, time zones are not uniform. They do not always follow lines of longitude, but rather they may follow political or geographic boundaries.

If time zones are assumed to be uniform, then the answer would be 360 (360 degrees around the earth)/24 (timezones)or 15 degrees.

Philidelphia is 15 degrees multiplied by 5 (1 hour per time zone) or 75 degrees.

Answer 4

Philadelphia Timezone