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A cough travels how many mph?

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Coughing is an action the body takes to get rid of substances irritating the air passages, and a cough is usually started to clear a buildup of phlegm (mucus) in the trachea. When a person coughs, air may move through this passage at up to 300 MPH. Source: http://www.nativeremedies.com/ailment/persistent-coughing-info.html
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How many mph does a bullet travel?

  It depends on several factors. Bullet can travel as slow as a few hundred feet per second up to several thousand feet per second. 1000 feet per second is about 682 MPH.

How many feet traveled at 30 mph?

At 30 mph, an object is moving at about 44 feet every second.