A bat flying in a cave emits a sound and

Question

receives its echo 0.4 s later.
How far away is the cave wall? Assume the
speed of sound to be 340 m/s.
Answer in units of m.

Answer 1

Distance * 2 (for the return)
= speed * time
= 340 m/s * 0.4 s.
Solve for distance.