The average speed of a vehicle on a stretch of a route between 6 A.M. and 10 A.M. on a typical weekday is approximated by the function , where is measured in miles per hour and is measured in hours, with corresponding to 6 A.M.

At what time of the morning commute is the traffic moving at the slowest rate? What is the average speed of a vehicle at that time?

A) time = 7 A.M. ; average speed = 50 mph
B) time = 7 A.M. ; average speed = 30 mph
C) time = 7 A.M. ; average speed = 45 mph
D) time = 7 A.M. ; average speed = 40 mph

Question

The average speed of a vehicle on a stretch of a route between 6 A.M. and 10 A.M. on a typical weekday is approximated by the function ​   , where  is measured in miles per hour and  is measured in hours, with  corresponding to 6 A.M.
​
At what time of the morning commute is the traffic moving at the slowest rate? What is the average speed of a vehicle at that time?
​
A) time = 7 A.M. ; average speed = 50 mph 
B) time = 7 A.M. ; average speed = 30 mph 
C) time = 7 A.M. ; average speed = 45 mph 
D) time = 7 A.M. ; average speed = 40 mph

Quizplus · Accepted Answer

The Answer of The average speed of a vehicle on a stretch of a route between 6 A.M. and 10 A.M. on a typical weekday is approximated by the function ​   , where  is measured in miles per hour and  is measured in hours, with  corresponding to 6 A.M.
​
At what time of the morning commute is the traffic moving at the slowest rate? What is the average speed of a vehicle at that time?
​
A) time = 7 A.M. ; average speed = 50 mph 
B) time = 7 A.M. ; average speed = 30 mph 
C) time = 7 A.M. ; average speed = 45 mph 
D) time = 7 A.M. ; average speed = 40 mph

The Average Speed of a Vehicle on a Stretch of a Route