A Jet Plane Travels Around the World at 3220 Km/hr $\mu$

A jet plane travels around the world at 3220 km/hr (894 m/s) . Two accurate atomic clocks measure the times of flight, one on board the plane and the second on Earth. If it takes 12 hours to complete the journey, what will the time difference (in $\mu$ s) be?

A) 0.75
B) 0.50
C) 0.25
D) 1.0
E) 0.19