Solve each part of following question given below:
Question: At 3:00 pm, a bank robber is spotted driving north on I-15 at milepost 130. His speed is 114 mi/h. At 3:39 pm he is spotted at milepost 186 doing 105 mi/h.
Part A: During this time interval, what is the bank robber's displacement? (Assume a straight highway for all calculations).
Part B: What is his average velocity?
Part C: What is his average acceleration?
I don't know how to get that answer. Please help.