Question 9
The speed of sound in air is 1100 feet per second. The speed of sound in steel is 16500 feet per second. Robin, one ear pressed against the railroad track, hears a sound through the rail six seconds before hearing the same sound through the air. To the nearest foot, how far away is the source of that sound?
**Editorial note for this self-study exercise:** Assume the same straight-line travel distance through air and steel, from the same emitted sound. Enter the distance in feet, rounded to the nearest integer, without units.
**Editorial note for this self-study exercise:** Assume the same straight-line travel distance through air and steel, from the same emitted sound. Enter the distance in feet, rounded to the nearest integer, without units.