# Question: the average speed of a greyhound bus from lansing to...

###### Question details

The average speed of a Greyhound bus from Lansing to Detroit is 117.5 km/h. On the return trip from Detroit to Lansing the average speed is 53.2 km/h on the same road due to heavy traffic. What is the average speed of the bus for the round trip?

What is the **arithmetic** mean of the two speeds
above?

What is the **harmonic** mean of the two speeds
above?