Answer: I just want to let you know that you got part A wrong. Let’s think about part B though. Part B asks for the speed. In order to solve this question, what is speed and how it measured on this graph? Instead of giving you just the answer, I am going to give you an hint/explanation.
Explanation:
So when it’s a distance-time graph and asks for speed, it is asking is it going fast/ slow/ at a constant rate? Decreasing? Increasing?
When it’s going fast and steady, it is going to move linearly in a upward direction. From 30 minutes and onward, the curve is going up.
Speed = change in distance / change in time. So basically rise/ run which is the slope formula.
So what is the position at 30 min? Then at 60 min? Change in anything is final- initial. Let me know if you still need help in the comments.