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A new unit of length is chosen such that the speed of light in vacuum is unity. What is the distance between the sun and the earth in terms of the new

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A new unit of length is chosen such that the speed of light in vacuum is unity. What is the distance between the sun and the earth in terms of the new unit, if light takes 8 min and 20 sec. to cover the distance ?
A. 300
B. 500
C. 400
D. 600
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Correct Answer - (b)
As distance = `"velocity" xx "time" = c xx t`
`:. S = 1x (8xx60+20) = 500 `new units
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