While you are standing in front of a wall, you clap your hands and you can clearly hear an echo from the wall after 1.4 seconds. The speed of sound in air is 343M/S. Approximately how far are you standing from the wall?

We have the next information
t=1.4 sec
s=speed of the sound 343 m/s
d=?
[tex]d=\frac{s\cdot t}{2}[/tex]then we substitute the values
[tex]d=\frac{(343)\cdot(1.4)}{2}[/tex][tex]d=\frac{480.2}{2}[/tex][tex]d=240.1m[/tex]the distance is 240 m