# A train covers 60 miles between 2 p.m. and 4 p.m. How fast was it going at 3 p.m.?

60

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The train was going at 30 miles per hour at 3 p.m.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

- An object is at rest at #(7 ,9 ,4 )# and constantly accelerates at a rate of #7/4 m/s^2# as it moves to point B. If point B is at #(5 ,1 ,8 )#, how long will it take for the object to reach point B? Assume that all coordinates are in meters.
- An object travels North at # 7 m/s# for #3 s# and then travels South at #1 m/s# for # 6 s#. What are the object's average speed and velocity?
- Mikaela is competing in a race. She runs 5 kilometers in .5 hour. How many kilometers can Mikaela run in 1 hr?
- A projectile is shot from the ground at a velocity of #2 m/s# and at an angle of #(pi)/2#. How long will it take for the projectile to land?
- If a projectile is shot at an angle of #(7pi)/12# and at a velocity of #21 m/s#, when will it reach its maximum height??

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