第一题.on a number line,point M has coordinate -6.4 and point N

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第一题.on a number line,point M has coordinate -6.4 and point N is 5.3 unite to the left of M.
find the N.
第二题.At1：30pm twoplanes leave in Chicago,one flying east at 540km/h,and the other flying westat 520km/h.At what time will they be 1450km?

你好稍等再答：第一题：m是坐标轴上的-6.4，n在m左边5.3个单位长度处。 n=-6.4-5.3=-11.7
再答： 13:30两架飞机从芝加哥出发，一架向东540km/h，一架向西520km/h，问什么时候两架飞机相距1450km?
再答： 1450km/(540km/h+520km/h)≈82min
再答：所以是14:52
再答：不懂请追问，满意请采纳哦

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