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相遇与超出@六年级分数应用题@同向与背向@秒思数学
张华和爷爷一起去操场散步。张华走一圈需要8分钟，爷爷走一圈需要12分钟。⑴如果两人同时同地出发，相背而行，多少分钟后相遇？⑵如果两人同时同地出发，同向而行，多少分钟后张华超出爷爷一圈？
六年级同步数学课程69/147
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