Why Does a Bullet Fired from a Bullet Train Appear to Travel at 0 MPH?

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When a bullet is fired from a bullet train moving at 190 mph, it appears to travel at 0 mph to an observer on the ground if both the bullet and the train are moving at the same speed in the same direction. This phenomenon occurs because the bullet's speed relative to the train is effectively canceled out by the train's speed. In an ideal scenario with no gravity or air resistance, the bullet maintains its velocity relative to the train. Therefore, to an outside observer, the bullet appears stationary as both it and the train are moving together at the same speed. This concept illustrates the principles of relative motion in physics.
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So today in physics my teacher was talking about the bullet train that is in japan. SO this train is traveling at 190 miles an hour, and on this day there is no gravity and no air. a man walks to the back of the train and fires a bullet from the back. My teacher said that a person watching the train go by will see the bullet go 0 mph. why is that??
 
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First for the example your teacher would have to state that this bullet travels at 190 mph, which is AWFULLY slow (may a low power air rifle). Given that information what is the only way to get 0 mph from two objects, each traveling 190 mph seperately?
 
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