A seismic station 4,000 kilometers distant noted the earthquake. The time gap between the arrival of the P-wave and the arrival of the S-wave was 320 seconds.
Please refer to the attached picture below. The graph indicates that the P-wave will reach the seismic station in 7 minutes. P-wave extrapolation stops at a vertical time scale cutoff of 7 minutes. At 12 min. 20 sec., the S-wave will reach the seismic station.
On the vertical scale, one minute is split into three segments. Thus, each segment will last 20 seconds.
So, travel time difference = S wave arrival - P wave arrival
= 12 minutes 20 seconds - 7 minutes
= 5 minutes 20 seconds
We know that 1 minute = 60 seconds
So, 5 minutes = 5 × 60
= 300 seconds
Consequently, the distance between the arrival of P wave and the arrival of S-wave = 300 seconds + 20 seconds
= 320 seconds
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