How long does the S-wave take to travel, if the delay between the waves are 8.0s?

Question

please try to answer as quick as you can because i really need a answer 

Answer 1

With the information given, all you can say is that the time interval between consecutive wave crests or consecutive wave peaks in 8.0 s, which must be the period of the wave.

 

Question:  What do you mean by S-wave?  The term S-wave has a specific meaning in quantum physics, but I do not think that is what you meant in this problem.