Latitude and longitude are measured in degrees, not metres.
Because the earth is (roughly) spherical, 1 degree along the equator is much larger than 1 degree nearer the poles. The formula for converting degrees to metres would need adjusting for distance from the equator. Although mathematically, this is not difficult to define, it is not particularly advantageous for most purposes.
The metre was originally defined as one ten millionth of the distance from the equator to the North Pole along the longitude passing through Paris. That definition is no longer used, but is still sufficiently accurate.
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Degrees of longitude are uniform in length. 1 degree (Longitude) = 69.69 miles*Cos(Ө)(latitude) however the length of a degree of latitude depends on were you are on the planet. A degree of latitude at the equator is notable longer than, for example, a degree of latitude at the latitude of Toronto, Canada.
Latitude and longitude are angles, and are described in the same units as any other angular quantity. 60 seconds = 1 minute 60 minutes = 1 degree 360 degrees = 1 full circle
There are many lines of latitude and longitude because they allow the user to locate a specific spot easier with a set of coordinates.
It is 3600 seconds for you have 60 minutes in every degree so there are 60 seconds in every minute.
The units are incompatible. One measures time the other is distance Unless you are talking about latitude and longitude minutes.