Answer
t = 0.0001 second.
Work Step by Step
The round trip is 30 km. If c denotes the speed of light, then d = 30 km = ct.
Solve for t = d/c.
$$\frac{30 km}{300,000 km/s} = 0.0001 s$$
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 26 - Think and Solve - Page 501: 34
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