Question 273180: When it is noon eastern standard time (EST) in New York City, it is 9:00 AM. Pacific standard time (PST) in San Francisco. A plane took off from New York City at noon EST and arrived in San Francisco at 4:00 P.M. PST on the same day. If a second plane left San Francisco at noon PST and took exactly the same amount of time for the trip, what was the plane’s arrival time (EST) in New York City?
(A)10:00 P.M.EST (B) 9:00 P.M. EST (C) 7:00 P.M. EST (D) 6:00 P.M. EST (E) 4:00 P.M. EST
Answer by Alan3354(69443)   (Show Source):
You can put this solution on YOUR website! When it is noon eastern standard time (EST) in New York City, it is 9:00 AM. Pacific standard time (PST) in San Francisco. A plane took off from New York City at noon EST and arrived in San Francisco at 4:00 P.M. PST on the same day. If a second plane left San Francisco at noon PST and took exactly the same amount of time for the trip, what was the plane’s arrival time (EST) in New York City?
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Step 1, convert all times to GMT, Greenwich Mean Time.
GMT = EST + 5
GMT = PST + 8
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A plane took off from New York City at 1700Z and arrived in San Francisco at 0000Z on the same day. If a second plane left San Francisco at 2000Z and took exactly the same amount of time for the trip, what was the plane’s arrival time in New York City?
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The plane from NY to SFO took 7 hours (0000 - 1700).
2000 + 700 = 0300Z (the next day), for the arrival in NY.
0300Z = 10 PM EST the same day
A
(A)10:00 P.M.EST (B) 9:00 P.M. EST (C) 7:00 P.M. EST (D) 6:00 P.M. EST (E) 4:00 P.M. EST
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Aviation does not use local time, they use GMT, and call it "Zulu time" from the Z used to designate it. This keeps all airplanes and ATC (Air Traffic Control) using the same times world-wide.
There's no AM and PM used either, obviously. Most countries in the world use a 24 hour clock, not the AM and PM foolishness.
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