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Unit conversion

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The CERN Hadron Collider has a circular track of length 27 km. If a proton travles at the speed of light, how many times round the track will it travel in 1 second? 

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Note, speed of light, $c = 670 \\times 10^6$ mph

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1 mile = 1609 m

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Convert miles into km.

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Convert hours into seconds.

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Distance = speed x time

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Divide final distance by length of the track.

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Transpose the formula to make L the subject. Substitute in the given values to calculate L. 

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