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One degree of angle is equal to 3,600 seconds of angle.
As there are 60 seconds in a minute, there are 1/60th of a minute in one second.
That's like asking "How many inches are in a length ?". Longitude is an angle on the Earth's surface, so it's only fitting and proper that it should be described in angle units. If the angle units are degrees, then each degree can be cut into 60 minutes, and each minute can be cut into 60 seconds. So 1 degree = 3,600 seconds.
1 minute = 60 seconds 18 x 60 seconds
60.