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Chapter 1: Q44E (page 22)

The accompanying sketch represents a maze of one-way streets in a city in the United States. The traffic volume through certain blocks during an hour has been measured. Suppose that the vehicles leaving the area during this hour were exactly the same as those entering it.

What can you say about the traffic volume at the four locations indicated by a question mark? Can you figure out exactly how much traffic there was on each block? If not, describe one possible scenario. For each of the four locations, find the highest and the lowest possible traffic volume.

Short Answer

Expert verified

The lowest possible values are 100, 120, 0, 0, and the highest possible values are 270, 250, 150 and 150.

Step by step solution

01

Consider the labeled diagram. 

The sum of incoming traffic equals the sum of outgoing traffic.

Consider the diagram to create equations.

The equations are,

300+a=400+bb+c+100=250d+300=a+320150+120=d+c

Simplify the above equations.

a=250鈭�cb=150鈭�cd=270鈭�c

02

Compute the highest and lowest possible traffic volumes. 

Consider the equation and substitute the values.

a=250鈭�cb=150鈭�cd=270鈭�c

The lowest possible traffic volume when, b=0

0=150鈭�c鈬�c=150a=250鈭�150鈬�a=100d=270鈭�150鈬�d=120

The highest possible traffic volume when, c=0

a=250鈭�0鈬�a=250b=150鈭�0鈬�b=150d=270鈭�0鈬�d=270

Hence, the lowest possible values are 100, 120, 0, 0, and the highest possible values are 270, 250, 150 and 150.

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