# Bullets fired, when can I hear it?

The bullet of a poacher flying at the speed of $$v=680\text{ m/s}$$ passes the gamekeeper at a distance $$d=1 \text{ m}$$. What was the distance (in meters) of the bullet from the gamekeeper when he began to sense its shrieking sound?

The speed of propagation of sound is $$c=340 \text{ m/s}$$.

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