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An earthquake generates two kinds of sound waves: a primary or P wave and a secondary or S wave. An earthquake occurs and generates a

An earthquake generates two kinds of sound waves: a primary or P wave and a secondary or S wave.
An earthquake occurs and generates a P wave with speed 8.41 km/s and S wave with speed 4.63 km/s which reach a seismograph, located some distance away. If the P wave is detected 74.2 s before the S wave, how far away (in km) is the seismograph from the earthquake?

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