ANSWER: 53 minutes
First, find what 1/3 of an hour equals in minutes. 20 minutes = 1/3 hour
Second, the goal is to find how many minutes it takes Ana to swim 1 mile, so you want to find how long it takes Ana to swim 1/8 of a mile.
3/8 mile = 20 minutes
20/3 = 6.666... so 1/8 mile = 6.666... minutes
Third, multiply the amount of time it takes to swim 1/8 mile by 8.
6.666 x 8 = 53.328 ⬅️ round to the nearest minute = 53 minutes