On 21 November at 2100 zone time, you depart LAT 32°12.0'N, LONG 69°26.0'W enroute to LAT 12°05.0'N, LONG 7°32.0'W. The distance is 3,519 miles, and the average speed will be 12.5 knots. What is the zone time of arrival?
• Speed–time–distance relationship for sea passages • Converting total steaming time in hours to days and hours • Accounting for the departure date and time when adding total steaming time
• First, how do you compute the total time for a voyage if you know the distance in nautical miles and the average speed in knots? Write that as a formula and calculate it. • Once you get the total hours, how many whole days and leftover hours does that represent? Be careful with any fractional hours. • When you add that number of days and hours to 2100 on 21 November, what calendar date and local clock time do you reach?
• Verify your use of the formula ( \text{Time (hours)} = \frac{\text{Distance (NM)}}{\text{Speed (knots)}} ). • Double‑check your conversion from hours to days + hours (no missing or extra hours). • Carefully count the days on the calendar from 21 November 2100 forward; make sure you land in the correct month and date before matching to the answer choices.
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