At 0820 zone time on 10 April you depart Yokohama, LAT 35°27.0'N, LONG 139°39.0'E (ZD -9). You are bound for Honolulu, LAT 21°18.5'N, LONG 157°52.2'W (ZD +10) and you estimate your speed of advance at 17.5 knots. The distance is 3,397 miles. What is your estimated zone time of arrival at Honolulu?

Correct Answer: Option C — 1527, 17 April

Steaming time is calculated by dividing distance (3397 miles) by SOA (17.5 knots), equaling 194.1 hours (8.09 days). Adding this elapsed time to the departure time in ZD -9 and converting the cumulative time across time zones to arrival zone time (ZD +10) gives the local arrival time.