At 1820 zone time, on 21 March, you depart San Francisco, LAT 37°48.5'N, LONG 122°24.0'W (ZD +8). You are bound for Melbourne, LAT 37°49.2'S, LONG 144°56.0'E, and you estimate your speed of advance at 21 knots. The distance is 6,970 miles. What is your estimated zone time of arrival at Melbourne?

Correct Answer: Option B — 0814, 5 April

Calculate total transit time by dividing distance (6,970 nm) by speed (21 kts), yielding 331.9 hours (13.83 days). Apply the time zone difference between San Francisco (+8) and Melbourne (-10), a 18-hour shift. Adding 13 days, 19 hours, and 50 minutes to the departure time results in 0814, 5 April.