The degree of longitude east of 5 degrees west is 4 degrees west longitude.
No
zero
They sit at the 40 degree East line of longitude.
A degree of longitude and latitude is further subdivided into minutes and seconds (units of arc, not time).
One degree east and one degree west. You're probably looking for the prime meridian and the International Date Line, but the IDL isn't a specific line of longitude.
The intersection of the equator (0 deg N) and the 180 deg longitude. At the equator and North of it the longitude is the International Date Line (IDL). At their intersection the IDL goes East to include Kiribati in the "Eastern" hemisphere.
The IDL roughly follows the meridian of 180° longitude.
where is 120 degree longitude
The degree of longitude east of 5 degrees west is 4 degrees west longitude.
0o longitude.
No
Except for some significant zigs and zags, the IDL nominally follows the meridian of 180° longitude.
Latitude: 21 degree north Longitude: 103 degree west
zero
The International Date Line (IDL) is a line of longitude located at about 180 degrees east (or west) of the Greenwich Meridian.
They sit at the 40 degree East line of longitude.