If a car travels p km at the speed of x km/h and traveles an other distance of q km at the speed of y km/h, drive the formula for average speed (S)?

Remember that:

Average speed = (Total Distance)/(Total Time)

And that:

Speed = Distance / Time

1. Find the time to cover distance p.
2. Find the time to cover distance q.
3. Find the total distance.
4. Find the total time.
5. Divide total distance by total time.

Post what you get! :)