1. Speed of light in vacuum, c = 1 new unit of length s⁻¹ t = 8 min. 20 sec, = 500 s x = ct = 1 new unit of length s⁻¹× 500s x = 500 new unit of length

    Speed of light in vacuum, c = 1 new unit of length s⁻¹
    t = 8 min. 20 sec, = 500 s
    x = ct = 1 new unit of length s⁻¹× 500s
    x = 500 new unit of length

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