A certain person’s work unit has a car that picks him up at his home at 7:00 am every day. One day, he leaves the house an hour earlier and walks towards his work unit. 10 minutes earlier, how many minutes did this person walk in the morning?
某人所在单位每天有车早上7点准时到他家接他上班，有一天，他提前1小时出门，朝单位方向走去，途中遇到接他上班的车，他坐上车到达单位比平时早10分钟，此人早上步行了多少分钟？
<gadget id="calculator">60 - 5</gadget>
<output>55</output>

<result>55</result>