To find out how many hours it would take for the falcon to fly 52,800 feet at a constant speed of 68 mph, you need to ensure that the units of distance are the same. Since the speed is given in miles per hour (mph), you should convert the distance from feet to miles.
1 mile = 5,280 feet
To convert 52,800 feet to miles:
\[ \text{Miles} = \frac{\text{Feet}}{5,280} = \frac{52,800}{5,280} = 10 \text{ miles} \]
With this conversion, you can then use the formula for time:
\[ \text{Time} = \frac{\text{Distance}}{\text{Speed}} \]
Substituting the values:
\[ \text{Time} = \frac{10 \text{ miles}}{68 \text{ mph}} \approx 0.147 \text{ hours} \]
Thus, you needed to convert the units of distance from feet to miles. Therefore, the answer is:
Option #1: miles