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SAT - Math - Speed Time Distance

When it is noon EST in New York City, it is 9 am PST in San Francisco.

When it is noon EST in New York City, it is 9 am PST in San Francisco. A plane took off from NYC at noon EST and arrived in San Francisco at 4 pm PST on the same day. If as 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 NYC?
(a) 10:00 PM EST
(b) 9:00 PM EST
(c) 7:00 PM EST
(d) 6:00 PM EST
(e) 4:00 PM EST

Given 12 noon in ET is 9am in PST

i.e.

ET = PST + 3 hours

TIme at which plane took off = 12 noon ET = 9 am PST

Time at which plane arrived = 4pm PST

total time taken = 7 hours

Second plane

Time at which plane took off = 12 noon PST = 3 PM ET

Time taken by plane = 7 hours

Time at which plane landed = 3PM + 7 hours = 10PM ET