A man standing 25 m away from a wall produces a sound and receives the reflected sound.
Calculate the time after which he receives the reflected sound if the speed of sound in air is `350ms^(-1)`.

Explanation

To solve the problem, we will follow these steps:

**Step 1: Understand the scenario.**
A man is standing 25 meters away from a wall. When he produces a sound, the sound travels to the wall and reflects back to him.

**Step 2: Calculate the total distance traveled by the sound.**
The sound travels to the wall and back, so the total distance \( D \) is:
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