Final answer:
Hadley paddled at a speed of 14080 miles per hour.
Step-by-step explanation:
To find the speed in miles per hour, we need to convert 2/3 miles to miles and 1/4 hour to hours. Since there are 5280 feet in a mile, 2/3 miles is equal to (2/3) * 5280 = 3520 feet. To convert 1/4 hour to hours, we divide 1 by 4, which equals 0.25 hours.
Next, we divide the distance in miles (3520 feet) by the time in hours (0.25 hours) to find the speed in miles per hour. 3520 / 0.25 = 14080 miles per hour.
Therefore, Hadley paddled at a speed of 14080 miles per hour.