Concept explainers
a.
Find the length l of the zone.
a.

Answer to Problem 31E
Explanation of Solution
Given information:
A police department has set up a speed enforcement zone on a straight length of highway. A patrol car is parked parallel to the zone,
Find the length l of the zone and the measures of angles
Calculation We shall use the fact that a speed enforcement zone is a straight highway of length
Let
Now in the right
Hence, the length of the zone is given by
b.
Find the minimum amount of time for a vehicle to pass through the zone.
b.

Answer to Problem 31E
Explanation of Solution
Given information:
A police department has set up a speed enforcement zone on a straight length of highway. A patrol car is parked parallel to the zone,
Find the minimum amount of time (in seconds) it takes for a vehicle to pass through the zone without exceeding the posted speed limit of
Calculation:
Now,
Since,
Now in
From (1),
The postal speed of vehicle passing through the zone is
Distance covered by vehicles= length of zone that is
Hence, minimum amount of time it takes for the vehicles to pass through the zone at speed of
Chapter 4 Solutions
EBK PRECALCULUS W/LIMITS
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