Given:
Distance from Earth to Mars when closest = 56,000,000 km
Speed of light = $3 \times 10^8$ m/s
Convert the distance to meters:
$56,000,000 \text{ km} \times 1000 \text{ m/km} = 56 \times 10^6 \text{ m}$
Calculate the time taken:
Time = Distance / Speed of
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