818 - Math - Problem Solving

Question: Two friends A and B run around a circular track of length 510 metres, starting from the same point, simultaneously and in the same direction. A who runs faster laps B in the middle of the 5th round. If A and B were to run a 3 km race long race, how much start, in terms of distance, should A give B so that they finish the race in a dead heat?

1. 545.45 metres
2. 666.67 metres
3. 857.14 metres
4. Cannot be determined