At 1210 zone time on 1 December, you depart...

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Question 1 of 2066636eea28f7522a1c51aa7b

At 1210 zone time on 1 December, you depart Seattle, LAT 47° 36.0' N, LONG 122° 22.0' W (ZD +8). You are bound for Guam, LAT 13° 27.0' N, LONG 144° 37.0' E, and you estimate your speed of advance at 20 knots. The distance is 4,948 miles. What is your estimated zone time of arrival at Guam?

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🔍 Key Concepts

• Time = Distance ÷ Speed to find total steaming time in hours and days • How to convert between zone time (ZT) and Greenwich Mean Time (GMT/UT) using zone descriptions (ZD), especially when crossing the International Date Line • Determining the correct zone description for Guam and whether the date moves forward or back when you cross from west longitude to east longitude

💭 Think About

• First, compute the total steaming time from Seattle to Guam using the given distance and speed. How many days and extra hours is that? • Convert your Seattle departure ZT to GMT using the given ZD. Then add the steaming time to get GMT of arrival. • From your arrival GMT, apply Guam’s ZD to convert back to ZT at Guam. Think carefully about the sign (+ or −) and whether you cross the International Date Line, which can change the calendar date.

✅ Before You Answer

• Confirm your time calculation: Use ( \text{Time (hours)} = \frac{\text{Distance (NM)}}{\text{Speed (knots)}} ), then convert hours to days + hours accurately. • Verify the correct zone description for Guam from standard time zone references (it’s west of the International Date Line in east longitude). Make sure the sign of ZD is right when converting between ZT and GMT. • After getting Guam ZT of arrival, double‑check whether the calendar date should be 11 December or 12 December based on all your conversions, then see which option matches your computed time most closely.

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