Three children take turns to play table tennis one-on-one on a table tennis table. They played for 1 hour, how many minutes did each child play on average?
3个小朋友轮流在一张乒乓球桌上一对一打乒乓球，他们打了1小时，平均每个小朋友打了多少分钟．
<result>60</result>