Physics q - need help

[xcutezix]

physics PLEASE HELP :(

please help me i really dont know how to do this question for physics

A cyclist travels to work at an average speed of 3 metres/sec and returns at an average speed of 9 metres/sec what is the average speed of the entire journey??

the answer is not 6 and it is not as simple as speed= distance/time please help

 

[Doc Al]

The average speed is found by dividing the total distance by the total time of travel. (Since you aren't given the distance, just make one up.)