## Conceptual Physics (12th Edition)

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