1.5 hours is equal to one and a half hours or 90 minutes.
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15/60 = 1/4 hour = 15 minutes
3 hours to travel 15 miles at 5 miles per hour
It is: 52/60 or 13/15 of an hour
15 knots = 15 nautical miles per hour, so 1/3 hour or 20 minutes
It is: 1/15 of 60 = 4 minutes