90 seconds. One minute is 60 seconds, 0.5 of a minute (half) is 30 seconds. 60 + 30 = 90
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900 / 60 = 15 900 minutes equals to 15 hours...
Yes.
75 minutes, which is also 1 hour and 15 minutes.
0.25 of an hour equals 15 minutes.
15 minutes equals 0.25 of an hour or of a degree (angular measure), but this second unit (hour/degree) MUST be present for the statement to be true.