The frequency of a radio wave from Mars to Earth is $6 \times 10^3 \, s^{-1}$. If the distance between them is $8 \times 10^7 \, km$,how much time will it take?
- A$4 \, min \, 16 \, sec$
- B$4 \, min \, 26 \, sec$
- C$6 \, min \, 10 \, sec$
- D$5 \, min \, 50 \, sec$
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