A Radar Pulse Sent Out to an Airplane at a Distance

Multiple Choice

A radar pulse sent out to an airplane at a distance of 24.9 km will return as an echo to the source in what time interval? (c = 3.00 × 10⁸ m/s)

A) 3.33E-5 s
B) 8.30E-5 s
C) 1.66E-4 s
D) 4.15E-5 s
E) 4.98E-4 s