draw a diagram..haha thats how i did it in primary school

來源: Mushy 於 2009-01-15 04:23:36 [] [舊帖] [給我悄悄話] 閱讀數 : (215 bytes)
本帖於 2009-01-19 10:06:15 時間, 由普通用戶 康MM 編輯

draw the y and x axis to indicate the distance traveled versus time. then draw a set of parallel lines with unit time apart to indicate the cars. reflect the set of lines to show the cars from the other direction...

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