It is a longitude. The "E" means east of the chosen reference point (meridian) - nowadays, usually the Greenwich meridian is used. Minutes and seconds are subdivisions of a degree; 1 degree = 60 minutes, and 1 minute = 60 seconds.
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30 minutes = 1,800 seconds
1 hour = 3600 seconds 30 minutes = 1800 seconds 1 hour + 30 minutes = 5400 seconds
1.5 minutes means 1 minute and 30 seconds.
3 Hours and 30 Minutes=210 minutes=12600 seconds
60 seconds are in a minute. 180 seconds are in 3 minutes. 210 seconds are 3 minutes and 30 seconds.