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【OG18-P162-111题】
At a certain instant in time, the number of cars, N, traveling on a portion of a certain highway can be estimated by the formula N= 20Ld600+s2
where L is the number of lanes in the same direction, d is the length of the portion of the highway, in feet, and s is the average speed of the cars, in miles per hour. Based on the formula, what is the estimated number
of cars traveling on a 1/2 mile portion of the Highway if the highway has 2 lanes in the same direction and the average speed of the cars is 40 miles per hour? (5,280 feet =1mile)
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N=(20*2*(5280/2))/600+402=48
613217ks
the length of the portion of the highway, in feet, 原来的圈就是feet为单位，后来换成了mile；分母的速度本来就是mile
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2022-11-26 05:32:18
HEHONGWEN
？？分子的1/2圈换成feet了，分母的40mile/h 为什么不换算？？
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2017-06-27 16:02:51
jillinyz回复HEHONGWEN
题目里说了，s is the average speed of the cars, in miles per hour
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2017-10-06 10:06:18
730以上回复HEHONGWEN
the length of the portion of the highway, in feet, 原来的圈就是feet为单位，后来换成了mile；分母的速度本来就是mile，还换成mile干嘛？！看清题干啊！
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2018-01-23 15:55:59
贾思敏回复 730以上
笑死 我也是想了好久 为啥最后有个单位换算！！！
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2022-03-11 19:32:42
WH-SRL
????为什么我算出来的带小数点
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2016-09-10 22:38:03
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