Using a stopwatch, the student determined that the echo occurs 3.8 seconds

Using a stopwatch, the student determined that the echo occurs 3.8 seconds after the sound signal was given, at what distance from the student was the obstacle

The speed of sound in air is 331 m / s.

It took the sound to travel the distance from the student to the obstacle and back, spending 3.8 seconds all the way. Determine the entire path traveled and divide it in half.

Decision. The distance traveled is equal to the speed multiplied by the time. 331 * 3.8 = 1257.8 meters.

We divide the traversed path in half. 1257.8 / 2 = 628.8 meters.

Answer 628.8 meters