It takes Caroline 1/5 of an hour to walk a mile. Four of Caroline's friends time themselves on their own walks of different leng
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so, they already used 4,885.78 this month, but whatever all five family members can use total for a month is 7,250.50, so since they already used 4,885.78, they have left 7,250.50 - 4,885.78 = 2364.72.