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【村长出题】有一幢10层的大楼,某人从1层走到3层需要30秒,照这样计算,他从3层走到10层需要多少秒?【伙伴出手】懒羊羊说:“1层到3层,爬了3层用了30秒,这样爬一层就要30÷3=10(秒),从3层爬到10层,就爬了7层,也就是7×10=70(秒)。”喜羊羊说:“这个问题不能这样思考,1层到3层有两个间隔,所以每个间隔用去的时间是30÷(3-1)=15(秒),3层到10层经过了10-3=7(个)间隔,这样就要用15×7=105(秒)。”美羊羊补充道:“这题的关键点在于有几个时间间隔。”
[A village head title] There is a 10-storey building, someone from layer 1 to layer 3 takes 30 seconds, according to this calculation, he went from layer 3 to layer 10 how many seconds? [Partner shot] lazy sheep said : “1 layer to 3 layers, climbed 3 layers with 30 seconds, so climb a layer will be 30 ÷ 3 = 10 (seconds), climbed from 3 layers to 10 layers, climbed 7 layers, that is, 7 * 10 = 70 (seconds). ”Pleasant said: “ This question can not think so, the first floor to the third floor has two intervals, so the time spent for each interval is 30 ÷ (3-1) = 15 Seconds), the 3rd to 10th floors have passed through 10-3 = 7 (intervals), so that 15 × 7 = 105 (seconds) will be used. ”The key point of this question is that there is Several time intervals. "