Ted, the postman, has 110 letters to deliver. If Ted can deliver 10 letters in 5 minutes,
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If a line's slope is 
, the slope of the perpendicular line is 
in this case, the given line has a slope 4, which is 4/1, so the perpendicular line has a slope/gradient
in this case, the given line has a slope 4, which is 4/1, so the perpendicular line has a slope/gradient