> In particular, cars travelling at greater speeds are normally more spread out than slower cars, so that over a given stretch of road there are likely to be more cars in the slower lane
How many cars pass a sign over an hour-long period?
It should be equal to speed (miles/hour) X density (cars/mile) (say that speed and density are constant over the hour)
So more cars in the fast lane will pass that sign than cars in the slow lane will over the hour if speed (fast) / speed (slow) > density (slow) / density (fast)
all i know about magnets is that they have north an south poles
and some of what you just said, that that theyre used in computers and trains and other things