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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.
6:1
That question cannot be answered without knowing the load on the beam.