Xiaoxing's distance from home to school is 900 meters, and he usually walks to school at a speed of 60 meters per minute. One day he was in a hurry, and it took him 3 minutes less time to get to school than usual. What is his walking speed in meters per minute on this day?
小星从家到学校的路程是900米，平时他以60米/分的速度步行到学校．一天他有急事，到学校的时间比平时少用了3分钟．这一天他步行的速度是多少米/分？
<gadget id="calculator">900 / 60</gadget>
<output>15</output>

<gadget id="calculator">15 - 3</gadget>
<output>12</output>

<gadget id="calculator">900 / 12</gadget>
<output>75</output>

<result>75</result>