
Concept explainers
To find: The rate at which the diffrence between two cars increasing after 2 hours.

Answer to Problem 15E
The distance betwqeen the car is increasing with the rate of 65 miles/hr.
Explanation of Solution
Given information:
Given that the two cars moving from same point from which one is going at 60 mi/h to south and other at 25 mi/h to west direction.
Calculation:
Figure (1)
Let both the cars start moving from the point P
After t hours the first car is at point A and second car is at B
Speed of first car is 60 mi/hr, then dxdt=60 mi/h
Speed of first car is 25 mi/hr, then dydt=25 mi/h
After 2 hours the distannce covered by the first car is x=120 mi
And the distance covered by the second car is y=50 mi
Let the distance between the cars be z at the time t
Then, by pythagoreas theorem
z2=x2+y2
When x=120 miles and y=50 miles
Then z2=(120)2+(50)2z2=16900z=130
Differentiating (1) with respect to t implicity
2zdzdt=2xdxdt+2ydydtdzdt=1z[xdxdt+ydydt]
Putting the values if x,y,z,dxdt+dydt , the rate of change vof the distance between car is
dzdt=1130[120(60)+50(25)]=1130[120(60)+50(25)]dzdt=65
Therefore the distance betwqeen the car is increasing with the rate of 65 miles/hr.
Chapter 4 Solutions
Single Variable Calculus: Concepts and Contexts, Enhanced Edition
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