A geologist is camped 8,000 m (5 miles) from a volcano as it erupts. (a) How much

Question:

A geologist is camped 8,000 m (5 miles) from a volcano as it erupts.
(a) How much time elapses before the geologist hears the sound from the eruption?
(b) How much time does it take the seismic waves produced by the eruption to reach the geologist’s camp, assuming the waves travel through granite as sound waves do?

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