At 0915 zone time on 7 April you depart San Francisco, LAT 37°48.5'N, LONG 122°24.0'W (ZD +8). You are bound for Kobe, LAT 34°40.0'N, LONG 135°12.0'E, and you estimate your speed of advance at 17 knots. The distance is 4,819 miles. What is your estimated zone time of arrival at Kobe?

Correct Answer: Option A — 2143, 19 April

Divide the total distance of 4,819 miles by the 17-knot speed of advance to find steaming time. Convert elapsed hours into days and add to departure time. Account for crossing the International Date Line and apply the zone description adjustments (ZD +8 at San Francisco to destination ZD) to establish the arrival date.