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P and S waves from an earthquake travel at different speeds, and this difference helps locate the earthquake "epicenter" (where the disturbance took place).
Assuming typical speeds of 8.4 km/skm/s and 5.4 km/skm/s for P and S waves, respectively, how far away did an earthquake occur if a particular seismic station detects the arrival of these two types of waves 1.5 minmin apart?
Express your answer to two significant figures and include the appropriate units.
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