There is a fly and there is a car. Car runs at 10m/sec and fly flies at 20m/sec.
The fly starts flying from a point X towards the coming car, touches it, and then fly back to X again. It again flies back to car..touches it and den fly back to X. This whole continues till the car reaches X.
The initial distance between car and X is 1km.
How much distance the fly travelled in the direction of car?