The two walked toward each other at the same time from two places 7,200 meters apart. One person rides a bicycle at a distance of 180 meters, and the other rides a motorcycle at a distance of 620 meters. After how many hours do they meet?
两人同时从相距7200米的两地相向而行．一人骑自行车每分行180米，另一人骑摩托每分行620米，经过几小时两人相遇？
<result>0.15</result>