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. No S-waves will arrive at this distance from the earthquake.
B. The P-waves will arrive 40 seconds before the S-waves.
C. The P-waves will arrive 400 seconds before the S-waves.
D. None of these choices are correct.
Answer: B
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