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Answer:
20 minutes.
Step-by-step explanation:
1/4 of an hour is 15 mins. If Emily can walk 3/4 of a mile in 15 mins, dividing both sides by 3 tells us it takes her 5 mins to walk 1/4 of a mile. Times both sides by 4 to find the answer - if takes her 20 mins to walk a full mile.