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Average vs Instantaneous Rates of Change Problem

  1. Sep 20, 2010 #1
    Hello, all. I'm doing a review in the back of my Calculus book and need help on this particular problem. The book has the answer, but I don't understand how to get it. If someone can show me steps to solving this problem, it would be greatly appreciated.

    Problem: The distance a person can walk in time t is given by d=√t where d is measured in miles and t is measured in hours.

    A) Find the average velocity from t=1 to t=4.
    B) Estimate the person's velocity at t=4 hours.

    The answers to the problem are:
    A) 1/3 MPH
    B) 0.25 MPH

    2. Relevant equations

    Ending words:
    So if anyone can show me the steps on solving this problem for both parts A and B, it would be greatly appreciated to not just me, but my knowledge itself...

    Thanks in advance,
  2. jcsd
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