At 1200 zone time on 10 October, you depart San Francisco, LAT 37°48.5'N, LONG 122°24.0'W (ZD +8). You are bound for Yokohama, LAT 35°27.0'N, LONG 139°39.0'E, and you estimate your speed of advance at 22 knots. The distance is 4,536 miles. What is your estimated zone time of arrival at Yokohama?

Question

At 1200 zone time on 10 October, you depart San Francisco, LAT 37&deg;48.5'N, LONG 122&deg;24.0'W (ZD +8). You are bound for Yokohama, LAT 35&deg;27.0'N, LONG 139&deg;39.0'E, and you estimate your speed of advance at 22 knots. The distance is 4,536 miles. What is your estimated zone time of arrival at Yokohama?

Accepted Answer

Option D: 1911, 19 October. Calculate transit time: 4,536 miles / 22 knots = 206.18 hours (8 days, 14 hours, 11 minutes). Adjust for the time zone change from +8 to -9, a 17-hour advance. Adding the elapsed time and zone adjustment to the departure time results in an arrival of 1911 on 19 October.