The most appropriate unit conversion in this context is:
Converting feet to inches by multiplying 10 feet by \( \frac{12 \text{ inches}}{1 \text{ foot}} \).
This choice correctly represents the conversion process (multiplying by the conversion factor) and ensures that the units of feet are converted to inches. Thus, you'll find the total distance in inches, which you can then use with the given velocity to calculate the time.