Let's begin by listing out the information given to us:
Ms Banks walks at about 3 ft/s
speed = /3 ft/,
time taken = 24 hours = 24 * 3600 = 86400 (when converted to seconds)
If she walked without taking a break, we have:
distance covered = sspeed* time taken= 3 * 86400
distance covered = 259200 feets
To convert feet to miles, divide the distance covered by 5280