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Source: OG11th

Level: 3

At a certain instant in time, the number of cars, N, traveling on a portion of a certain highway can be estimated by the formula


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 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

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