   Chapter 1, Problem 77AP

Chapter
Section
Textbook Problem

Assume there are 100 million passenger can in the United States and that the average fuel consumption is 20 mi/gal of gasoline. If the average distance traveled by each car is 10 000 mi/yr, how much gasoline would be saved per year if average fuel consumption could be increased to 25 mi/gal?

To determine
The amount of gasoline would be saved per year if average fuel consumption could be increased to 25mi/gal .

Explanation

Given Info: In US number of passenger is 100million . Initially, fuel consumption rate is 20mi/gal .

Explanation:

Increased fuel consumption rate is 25mi/gal . Average distance travelled by each car is 10000mi/yr .

The total distance travelled each year is,

d=(100×106cars)(104mi/car)=1×1012mi

Formula to calculate the fuel used per year is,

V1=dR1

• V1 is amount of fuel,
• d is the total travelled distance,
• R1 is the rate

Substitute 1×1012mi for d , 20mi/gal for R1 to find V1 .

V1=(1×1012mi)(20mi/gal)=5×1010gal

Formula to calculate the increased fuel used per year is,

V2=dR2

• V2 is amount of fuel,
• d is the total travelled distance,
• R2 is the rate

Substitute 1×1012mi for d , 25mi/gal for R2 to find V2

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