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题库 / GMATAdvanced-PS-13
The figure above represents a network of one-way streets. The arrows indicate the direction of traffic flow and the numbers indicate the amount of traffic flow into or out of each of the four intersections during a certain hour. During that hour, what was the amount of traffic flow along the street from R to S if the total amount of traffic flow into P was 1, 200?
(Assume that none of the traffic originates or terminates in the network)
200
250
300
350
400
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任意一个点流入=流出，S点流入=550+RS=S点流出=400+400
RS=800-550=250
图上都是单行道，箭头是行进方向，数字是进去每个点或者出每个点的车流量，某个小时里进p的总流量是1200，问R到S的流量
进P的有两个，一个是800一个是SP，加起来1200说明SP400，S相关的四个方向有进550出400出SP和进RS，RS+550=400+400，因此RS=250
P是1200， 流入P点的是800和S，流入S的是550和R，但是S还要流出400。
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into S = out of S → 550+x=400+(1200-800)