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401300000 km is 4.013 x 1011 m. The speed of light is 3 x 108 m s-1. Divide the two and you get 1338 seconds, which is 22.29 minutes.

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Robotic spacecraft on Mars have sent radio signals back to earth the distance from Mars to Earth at its greatest isi 401300000 km About how many minutes would it take a signal to reach Earth?

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