Kinematics problem

Two cyclists, A and B, have displacements 0 km and 70 km, respectively. At t=0 they begin to cycle towards each other with velocities 15 km/h and 20 km/h, respectively. At the same time, a fly that was sitting on A starts flying towards B with a velocity of 30 km/h. As soon as the fly reaches B, it immediately turns around and flies towards A, and so on until A and B meet.
(A) What will the displacement of the two cyclists and the fly be when all 3 meet?
(B) What will be the distance traveled by the fly?
*Note* Answers are: a)30 km/h and b)60 km/h
Thanks
Answer #1
http://www.physicsclassroom.com/class/1dkin/u1l6b.cfm
Answer #2
Thanks for your reply. I understand the basic equations it’s just that this problem is confusing in the sense that I am thinking of position in terms of displacement and the fact that there is no acceleration which really throws me off. What equation should I use?