Agirl is riding a bicycle at a constant velocity of 3.0ms^-1 along a straight road. at time t=0, she passes a boy sitting on a stationary bicycle. at time t=0, the boy sets off to catch up with the girl. his velocity increases from time t=0 until t=5.0s, when he has covered a distance of 10m. he then continues at a constant velocity of 4.0ms^-1. a) draw the displacement-time graph for the girl from t=0 to 12s. b) on the same graph axes, draw the displacement-time graph for the boy. c) using your graph, determine the value of t when the boy catches up with the girl.