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

来源: Mushy 于 2009-01-15 04:23:36 [] [旧帖] [给我悄悄话] 本文已被阅读： 次 (215 bytes)
本文内容已被 [ Mushy ] 在 2009-01-19 10:06:15 编辑过。如有问题，请报告版主或论坛管理删除.
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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