7th grade math

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Telephone calls travel through optical fibers at the speed of light, which is 186,000 miles per second. A millisecond is 0.001 of a second. How far can your voice travel over an optical line in 1 millisecond?

  • 7th grade math -

    The speed of light in optical fiber is actually closer to 120,000 miles per second. It travels more slowly in glass than in air or vacuum.

    The first sentence in your question is in error. The method of solution remains the same as jai's answer.

  • 7th grade math -

    30-nfor n =8

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