At 0915 zone time on 11 May you depart...

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Question 1 of 2066636eea28f7522a1c51a983

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?

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🔍 Key Concepts

• Time-Speed-Distance (TSD): Use the basic formula to find travel time from distance and speed. • Zone Description (ZD) and Time Zones: Understand how ZD relates to local time vs GMT/UTC and how ZD changes as you move east/west. • Date Line Crossing: Consider what happens to the date and time when crossing the 180° meridian on a trans-Pacific voyage.

💭 Think About

• First, compute how many hours the voyage will take using the given distance and speed. What unit will your answer be in, and how will you convert it to days and hours? • Once you know the elapsed time, add it to the departure zone time. Then, think about how many time zones you cross between the departure longitude and arrival longitude. • Seattle and Yokohama have different zone descriptions (ZD). How do you correctly adjust from departure ZD to arrival ZD, especially after crossing the 180° meridian?

✅ Before You Answer

• Recalculate the elapsed time using ( \text{Time} = \frac{\text{Distance}}{\text{Speed}} ) and convert decimal hours to hours and minutes carefully. • Check your signs when applying ZD: ZD east is usually + and ZD west is − when converting to/from GMT/UTC; don’t mix them up. • After adding elapsed time and adjusting for ZD change, verify whether you need to add or subtract a calendar day due to crossing the 180° meridian.

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