On this time-travel curve, if a large earthquake is 400 km away from the station, what can you say about the arrivals of the P- and S-waves? 
A) the P-waves will arrive 40 seconds before the S-waves
B) the P-waves will arrive 400 seconds before the S-waves
C) no S-waves will arrive at this distance from the earthquake
D) none of these
Correct Answer:
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