1. (6 marks) Samir is biking along a straight path, starting in the 3(1) 9 northbound direction. Here is a graph that shows ' Samir's position 3 (in kilometers) at time t (in hours). \"-403 l (a) What is Samir's average velocity in the time from t = 1 to t : 4? I'LOJI-F-UIO') _l (b) What is Samir's velocity at time t : 7.5 and in what direction is he moving? (c) By looking at the graph, determine whether Samir is speeding up or slowing down at time t : 6.1. Explain your reasoning