If a car travels a distance at 20km/h and then returns the same distance at 30km/h what is the average speed over the whole trip?

Let's say the car is travelling 60km.

So travelling at 20km/h, it takes it 3 hours to travel that distance.

Coming back, to cover 60km at 30km/h, it takes it 2 hours to travel the distance.

Thus in 5 hours, it covers a distance of 120km. Speed = distance / time = 120/5 = 24km/h.

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