if you shout into the grand canyon your voice travel at the speed of sound (340m/s) to the bottom of the canyon. how depp is the grand canyon at a spot where someone at the bottom can hear your voice 3.5 seconds after you shout ​
It takes 3.5 seconds for the sound to reach the bottom of the canyon and then return to the top. Â So it takes half the time to reach the bottom, or 1.75 seconds.
