Four bicyclists travel different distances and times along a straight path. Which cyclist traveled with the greatest average speed?

the answer to this question is 60 n

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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elctricity and magnet is conversion to it