If light moves at a speed of about 3.00 x 108 m/s, how long will it take light to travel the distance of a marathon (about 42.2 km)? express your answer in microseconds using the correct number of significant figures. do not enter your answer using scientific notation.
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If light moves at a speed of about 3.00 x 108 m/s, how long will it take light to travel the distanc...
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