The speed in air is 343m/s. Using the relationships3.3 feet in a meter, 5280 feet in a mile, and the time relationships you know, determine the speed in miles per hour. (answer:772mi/h)

V = 343m/s * 3600s/hr * 3.3ft/m * 1/5280miles/ft = 771.8 miles/hr

To determine the speed in miles per hour, we need to convert the speed from meters per second to miles per hour. Here's how we can do it step by step:

1. Start with the speed given in meters per second, which is 343 m/s.

2. Convert meters to feet. Since there are 3.3 feet in a meter, we multiply the speed by 3.3:
343 m/s * 3.3 ft/m = 1131.9 ft/s (rounded to one decimal place)

3. Convert feet to miles. Since there are 5280 feet in a mile, we divide the speed in feet per second by 5280:
1131.9 ft/s / 5280 ft/mi = 0.2149 mi/s (rounded to four decimal places)

4. Convert seconds to hours. Since there are 3600 seconds in an hour, we multiply the speed in miles per second by 3600:
0.2149 mi/s * 3600 s/h = 773.64 mi/h (rounded to two decimal places)

So, the speed in miles per hour is approximately 773.64 mi/h, which can be rounded to 772 mi/h as given in the answer.