Answer
The cave wall is 17 m away.
Work Step by Step
During the 0.1 second time interval, the sound pulse went to the wall, and back. The sound reached the wall in 0.05 seconds.
$$d = speed \times time = 340 \frac{m}{s} \times (0.05 s) = 17 m$$
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 20 - Think and Solve - Page 389: 36
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