How fast was the blast cloud moving

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Question: On the day of the main Mt. St. Helens eruption, seismometers 6 km from the blast origin stopped transmitting 77 seconds after the eruption, when they were overridden by a dense pyroclastic blast cloud. Based on this information, how fast (in km per hour) was the blast cloud moving? Show your math.

Reference no: EM133428229

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