At 0915 zone time on 11 May you depart Yokohama, LAT 35°27.0'N, LONG 139°39.0'E (ZD -9). You are bound for Seattle, LAT 47°36.0'N, LONG 122°22.0'W, and you estimate your speed of advance at 19.5 knots. The distance is 4,276 miles. What is your estimated zone time of arrival at Seattle?

Question

At 0915 zone time on 11 May you depart Yokohama, LAT 35&deg;27.0'N, LONG 139&deg;39.0'E (ZD -9). You are bound for Seattle, LAT 47&deg;36.0'N, LONG 122&deg;22.0'W, and you estimate your speed of advance at 19.5 knots. The distance is 4,276 miles. What is your estimated zone time of arrival at Seattle?

Accepted Answer

Option A: 1932, 19 May. Divide 4276 miles by 19.5 knots to get 219.28 hours (9 days, 3 hours, 17 minutes). Adding this to the 0915 departure on 11 May, then adjusting for the zone time shift from -9 to +8 (a 17-hour difference), results in an estimated arrival of 1932 on 19 May.