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1.一列火车长250米,以每分钟1000米的速度穿过长度为500米的隧道,要多长时间?2.一只螃蟹有8条腿,一只甲虫有6条腿,现有螃蟹和甲虫的腿共34条,那么有多少只螃蟹和甲虫呢?
1. How long does it take for a train 250 meters long to pass through a tunnel of 500 meters at a speed of 1000 meters per minute? 2. One crab has eight legs and one beetle has six legs. The existing crab And the legs of a total of 34 beetles, then how many crabs and beetles it?