일반물리학 1 — Motion Along a Straight Line: Problem 7

7 A pigeon flies at 36 km/h to and fro between two cars moving toward each other on a straight road, starting from the first car when the car separation is 40 km. The first car has a speed of 16 km/h and the second one has a speed of 25 km/h. By the time the cars meet head on, what are the (a) total distance and (b) net displacement flown by the pigeon?