[SOLVED] in which one of the following locations can a person hear the echo of a sound

In which of the following locations can a person hear the echo of a sound?
In which of the following locations can a person hear the echo of a sound?

Answer:

The best answer for in which of the following locations can a person hear the echo of a sound is

A person can hear the echo of a sound: At least 16.6 meters in front of the reflecting surface.

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