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1 quarter hour is 15 minutes. So 5 quarter hours would be 75 minutes. 5x15=75
315 minutes.
Quarter to 6 o'clock is 5:45. Quarter to means 15 until the next hour. 15 is a quarter of 60. The other way of looking at is 45 minutes of the current hour have passed and there is a quarter left until the next.
30 minutes
There are: 5.25 times 60 = 315 seconds