A flight in an airplane going 300 m/s takes one hour as measured by a person in the airplane. How long did this flight take according to an observer on the ground?
A. 1.8 ns less than 1.0 hour
B. 3.6 ns less than 1.0 hour
C. Exactly 1.0 hour.
D. 3.6 ns more than 1.0 hour
E. 1.8 ns more than 1.0 hour
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