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 Velocity=distance/time 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, ~Lolzwhut?