一道数学题(关于火车的)
甲、乙两列火车均长180m,若两车相对行驶,从车头相遇到车尾相离共用12秒.若两车同向行驶,那么从甲车头挨到乙车尾直到甲车尾超过乙车头共用60秒.如果甲乙两车的速度不变,求甲、乙两列车的速度.
人气:333 ℃ 时间:2020-03-21 08:43:39
解答
设 甲车速为x,乙车速为y
所以
180 * 2 / 12 = x+ y
180 * 2 /60 = x- y
=〉
x = 18m/s
y = 12m/s
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