6 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 three

meet?

(b) What will be the distance travelled by the

fly?