1. An epicenter station is 4,000 km away. How long after the first P-wave did the first S-wave arrive? 2. An epicenter station is 5,600 km away. How long after the first P-wave did the first S-wave arrive? 3. How far can an S-wave travel in 6 minutes 40 seconds? 4. How far can a P-wave travel in 6 minutes 40 seconds?

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