To convert the speed of sound from kilometers per hour (km/h) to feet per second (ft/s), you can follow these steps:
- Convert kilometers to miles: There are 0.621371 miles in a kilometer.
- Convert miles to feet: There are 5280 feet in a mile.
- Convert hours to seconds: There are 3600 seconds in an hour.
The conversion factors can be combined into a single conversion factor from km/h to ft/s:
\[ \text{1 km/h} = \frac{0.621371 \text{ miles}}{1 \text{ km}} \times \frac{5280 \text{ feet}}{1 \text{ mile}} \times \frac{1 \text{ hour}}{3600 \text{ seconds}} \]
Calculating this gives:
\[ 1 \text{ km/h} \approx 0.621371 \times 5280 / 3600 \approx 0.911344 \text{ ft/s} \]
Now, to convert 1225 km/h to ft/s:
\[ 1225 \text{ km/h} \times 0.911344 \text{ ft/s per km/h} \approx 1115.75 \text{ ft/s} \]
Thus, the speed of sound at sea level at 59 degrees Fahrenheit, when converted from kilometers per hour to feet per second, is approximately 1115.75 ft/s.