<human>:  John and Jack have 30 minutes to walk to school together. It takes them 6 minutes to get to the corner where the library is. It takes them another 13 minutes to get to the fire station. How much longer do they have to get to school without being late?
<bot>: How many minutes do John and Jack have left after arriving at the library? ** John and Jack arrive at the library with 30 - 6 = <<30-6=24>>24 minutes left to reach the fire station.
How many minutes do John and Jack have left after arriving at the fire station? ** They then arrive at the fire station and have 24 - 13 = <<24-13=11>>11 minutes left to get to school without being late.
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