The distance between Xiao Ming's home and school is 1800 meters, which usually takes 24 minutes. One day he was in a hurry and walked 15 meters more per minute than usual. How many minutes did Xiao Ming use to walk from home to school?
小明从家到学校和路程是1800米，平时走24分．一天他有急事，每分比平时多走15米，这天小明用多少分从家走到学校？
<gadget id="calculator">1_800 / 24</gadget>
<output>75</output>

<gadget id="calculator">75 + 15</gadget>
<output>90</output>

<gadget id="calculator">1_800 / 90</gadget>
<output>20</output>

<result>20</result>