Answer: 99.3667 feet per second approximately
Work Shown
271 miles = 271*5280 = 1,430,880 feet
4 hours = 4*3600 = 14,400 seconds
Note: 1 hr = 60 min and 1 min = 60 sec, so 1 hr = 60*60 = 3600 sec
distance = rate*time
rate = distance/time
rate = (1,430,880 feet)/(14,400 seconds)
rate = 99.3667 feet per second approximately
The 6's in that decimal number go on forever, but we have to round at some point. Round however your teacher instructs.
Side note: her speed in mph is 271/4 = 67.75 mph exactly, and this value hasn't been rounded.