Someone gets off work at 5 o'clock every afternoon, and a car arrives on time to pick him up. One day, he finished work an hour early and walked home because the car did not arrive. On the way, he met the car that came to pick him up and took the car instead. As a result, he arrived home 10 minutes earlier than usual. How many minutes did the person walk to meet the car that picked him up car.
某人每天下午5点钟下班，有汽车按时到达接他回家．一天，他提前一个小时结束工作，因汽车未到达而步行回家，在途中遇到来接他的汽车又改为乘车，结果比平时早10分钟到家，此人步行多少分钟遇到接他的汽车．
<result>55</result>