Distance cannot be expressed in time. If it could, then you'd be able to figure out how many minutes high your house is, and how many miles of sleep you had last night.
With many thanks to another contributor who put my thoughts into his words.
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To determine how long 15 miles will take in minutes, we need to know the speed at which the distance is being covered. If we assume a constant speed of 60 miles per hour, then it would take 15 minutes to travel 15 miles. However, if we are walking at a pace of 3 miles per hour, it would take 5 hours to cover the same distance. The time taken to travel 15 miles in minutes depends on the speed at which the distance is being covered.