Two trains, 200 km apart, are moving toward each other at the speed of 50 km/hour each. A fly takes off from one train flying straight toward the other at the speed of 75 km/hour. Having reached the other train, the fly bounces off it and flies back to the first train. The fly repeats the trip until the trains collide and the bug is squashed.
What distance has the fly traveled until its death?
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150km
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2个小时后火车相撞
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2 hrs, 150km?
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可怜的苍蝇
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孩子看到这道题很反应很好玩
读题的时候: oh, poor fly...----> 读完题：OMG (so complicated!) -----> 几秒钟后：oh..right..150km...
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A passenger train leaves New York for Boston traveling at the speed of 80 km/hr. In half an hour a freight train leaves Boston for New York traveling at the speed of 60 km/hr.
Which train will be further from New York when they meet?
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150km
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几年级的题目啊楼主？
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一楼吗？学过速度概念以后就可以做。
七楼的，几年级都无所谓，孩子往往比大人快。
家里孩子五年级，最近喜欢玩儿brain teaser，来回的折腾基本概念。
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太有意思了，这样类似的题在哪儿能找到呢？我都想做着玩儿。
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