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A span is 8" or 0.67 foot. That is an informal measurement from the tip of the thumb to the tip of the pinkie on a average spread hand.
It is equal to to 72 because 2x6=12 and 3x2=6 and 12x6=72 or if you think this is to complicated, you can do 2x6=12, 12x3=36, and then 36x2, which then also gives you 72
Depends upon your personal "stride" ... the span of distance between each foot when walking normally.
That question cannot be answered without knowing the load on the beam.
6:1