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An earthquake generates both transvere (S) and longitudinal (P) sound waves in the earth . The speed of S waves is about 4.5 km/s and that of P waves is about 8.0 km/s. A seismograph records P and S waves from an earthquake. The first P was arrives 4.0 min before the first S wave. The epicenter of the earthquake is located at a distance about

1. 25 km
2. 250 km
3. 2500 km
4. 5000 km

Correct answer: 2500 km

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