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Start the planAt a certain instant in time, the number of cars, \(N,\) traveling on a portion of a certain highway can be estimated by the formula
\(N=\dfrac{20Ld}{600+s^2}\)
where \(L\) is the number of lanes in the same direction, \(d\) is the length of the portion of the highway, in feet, and s is the average speed of the cars, in miles per hour. Based on the formula, what is the estimated number of cars traveling on a \(\frac12\)-mile portion of the highway if the highway has \(2\) lanes in the same direction and the average speed of the cars is \(40\) miles per hour? (5,280 feet = 1 mile)
(A) 155
(B) 96
(C) 80
(D) 48
(E) 24
Answer: D
Source: Official Guide
\(N=\dfrac{20Ld}{600+s^2}\)
where \(L\) is the number of lanes in the same direction, \(d\) is the length of the portion of the highway, in feet, and s is the average speed of the cars, in miles per hour. Based on the formula, what is the estimated number of cars traveling on a \(\frac12\)-mile portion of the highway if the highway has \(2\) lanes in the same direction and the average speed of the cars is \(40\) miles per hour? (5,280 feet = 1 mile)
(A) 155
(B) 96
(C) 80
(D) 48
(E) 24
Answer: D
Source: Official Guide
