The speed of sound in air is approximately 340 ms The speed

The speed of sound in air is approximately 340 m/s. The speed of sound in steel is approximately 5900 m/s. If your friend strikes one end of a steel pipe with a hammer while you listen at the other end, you will hear two distinct sounds: one traveling through the air and the other traveling through the steel pipe. If the pipe is 1.94 seconds elapses between the two distinct sound, how long is the steel pipe.

Solution

t sec taken sound in air.

(t-1.94) sec taken sound in steel.

So,

340*t=(t-1.94)5900

Or, (5900-340)t=5900*1.94

Or, 5560t=11446

Or, t=2.0586331 sec

steel pipe length= (2.0586331*340)=699.935 m