'faster' means a greater speed
speed=distance/time
the dimensions are units of distance and units of time
Tortoise A has a distance of 52ft per 1 hour or 52ft/1hr
Tortoise B has a distance of 12in per 1 min or 12in/1min
we need to convert them to the same units
let's convert the speed to inches/min
1ft=12 inches
52ft=52*12in=624in
1hr=60min
52ft/1hr=624in/60min=52in/5min=10.4in/1min
Tortoise A walks 10.4in/1min
Tortoise B walks 12in/1min
12in>10.4in
Tortoise B walks faster