There are 60 minutes in an hour. In analogue time, we break up the hour into halves again. We usually say that the first 30 minutes are past the hour and next thirty minutes are to the hour.
6.05pm would be called 'five past six' because 5 minutes have passed since the hour of 6pm. However, 6.55pm would be called 'five minutes to seven' because there are only 5 minutes to go until the next full hour of 7pm.
If you are working out how long things will take, such as on train timetable, you can calculate time by working out how many minutes there are to go until the next hour then add on the remaining minutes.
So, if a train leaves Manchester at 09:55 and arrives in Stockport at 10:30, we can find out how long the journey takes by adding the amount of minutes it takes to get from 9:55 to 10:00 (5 minutes) and then add on the time it takes from 10:00 until 10:30 (30 minutes).
So 5 minutes added to 30 minutes = 35 minutes.
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