What Are Counter-Propagating Waves and Their Amplitude Scenarios?

[XwakeriderX]

I was given an amplitude of a wave and was asked "What is the amplitude of each of the two counter-propagating waves that give rise to this standing wave" So since it says "counter-propagating" that means the waves are stacked on each other? so its really just half the given amplitude. Basically I'm trying to define counter propagating and in addition what other scenarios could be possible instead of counter propagating. Thanks!

 

[XwakeriderX]

Sorry wrong spot to post! can't figure out how to delete