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Chemistry 7 Online
OpenStudy (anonymous):

The speed of light is 3.00 \times 10^8{\rm m/s}. How long does it take for light to travel from Earth to the Moon and back again?

OpenStudy (anonymous):

it takes around 1,280 seconds

OpenStudy (vincent-lyon.fr):

This is just one-way.

OpenStudy (goformit100):

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