Right Before Takeoff,a Passenger on a Plane Flying from Town

Right before takeoff,a passenger on a plane flying from town A to town B synchronizes his clock with the clock of his friend waiting for him in town B. The plane flies without interruption at a constant velocity of 280 m/s. The moment the plane touches the ground the two friends check simultaneously the indication of their clocks.The clock of the passenger on the plane shows that it takes exactly 7.50 h to travel from A to B. Ignoring any effects of acceleration,the difference between the readings of the clocks B and A is

A) 11.8 ns.
B) -11.8 ns.
C) 23.5 ns.

Correct Answer:

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