You are on a voyage from Belem, Brazil to Mobile, AL. The distance from departure to arrival is 3150 miles. The speed of advance is 14.0 knots. You estimate a layover in San Juan, Puerto Rico, of 17.5 hours. If you took departure at 2200 (ZD +3h 30m), 26 February, what was your ETA (ZD +6) at Mobile?
• Use Speed = Distance / Time and convert miles and knots consistently (1 knot = 1 nautical mile per hour). • Account for the layover time separately from the underway steaming time. • Convert between time zones (ZD +3h30m to ZD +6) and watch for date changes when adding total travel time.
• First, ignoring the layover, how many hours will it take to travel 3150 miles at 14 knots? Show the division and units clearly. • After you find total steaming hours, add the 17.5-hour layover. How many calendar days and leftover hours does that make? • When you add that total time to 2200 on 26 February in ZD +3h30m, on what local date and time do you arrive, and then how does that change when you convert to ZD +6?
• Be sure you are using nautical miles for distance when working with knots. • Double-check your hours-to-days conversion (24 hours = 1 day) and keep track of how many times you cross midnight. • Verify your zone description conversion: going from ZD +3h30m to ZD +6, are you moving clocks ahead or back, and by how many hours and minutes?
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