Answer
$231,000 \frac{km}{s}$, which is about 77 percent of the modern value.
Work Step by Step
$$v = \frac{300,000,000 \; km}{1300 s} = 231,000 \frac{km}{s}$$
$$ \frac{231000 km/s}{300000 km/s} = 0.77$$
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: 33
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