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Home > PC > Chapter 10 > Lesson 10.2.1 > Problem 10-75


Driving from Cleveland to Washington, D.C., Ernie averaged mph for the first hours, mph the next hour due to construction, and mph for the final hours of his journey.

  1. How fast was he going after one hour?

    Ernie averaged mph for the first hours. Does this mean he drove at a constant rate?

  2. What was his average rate for his entire hour trip?

    average speed total distance / total time

    Determine Ernie's total distance from the given information.
    Then divide by the total time ( hours).