Answer: 48 minutes
Explanation:
Kayla house to her grandmother's house=12 minutes
Her grandmother's house to Kayla house=12 minutes.
Total minutes per day is 12 min+12mins= 24 minutes.
Kayla spends 24 minutes to walk the two houses in one day.
If she walks to and from two days in a week
24 minutes×2=48minutes
Therefore, Kayla spends 48 minutes walking between the two houses twice in a week.