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La luz recorre 3 x 10 ⁸ m en 1 seg y 15 km = 15 x 10³ m, entonces la proporción es :
3 x 10⁸ ------ 1 s
15 x 10³ ------ x s
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x = 15 x 10³ ( 1 ) / 3 x 10⁸ aplicamos las leyes de los exponentes
x = 5 x 10 ⁻⁵ s = 0.00005 s ó 5 cienmilésimos de segundo