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KOK103
speed of light is around one foot per nanosecond. One foot is about 12 inches. Light travels approximately 12 inches in one nanosecond.
IssacAsimov
Speed of light can be approximated to 3×10⁸ m/s. 
That is, light travels 3×10⁸ m in 1 seconds
Let it travels x meters in 1 nano seconds(10⁻⁹)
Therefore, 
3×10⁸=1
x = 10⁻⁹
x = 3×10⁸×10⁻⁹ = 0.3 meters.