CPM Homework Banner

Home > A2C > Chapter 4 > Lesson 4.1.2 > Problem 4-25


Lettie just got her driver's license. Her friends soon nicknamed her “Leadfoot” because she is always going mph on the freeway even though the speed limit is mph.

  1. At this speed, how long will it take her to travel 50 miles?

    Write an equation. Let  # of hours. Lettie drives, .

    hours or about minutes.

  2. How long would it take her if she drove the miles at mph?

    Write an equation similar to the one in part (a).

    hours or about minutes.

  3. Speeding tickets carry fines of about and usually increase the cost of insurance. If Lettie gets a ticket on this trip, then what would be her cost per minute of time saved?

    Divide $200 by the number of minutes saved.

    At least per minute.