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Answer:
4,767 seconds
Step-by-step explanation:
The speed of light is actually 3x10^8 m/s, not "3 × 10 ms-¹."
Convert 1.43 × 10⁹ km = 1.43 × 10^12 m
(1.43 × 10⁹ km = 1.43 × 10^12 m)/(3x10^8 m/s) = 4,767 seconds