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163. 17463-!-item-!-187;#058&011464 Themass of 1 cubic meter of a substance is 800 kilograms under certainconditions. What is the volume, in cubiccentimeters, of 1 gram of this substance under these conditions? (1 kilogram = 1,000 grams and 1 cubic meter =1,000,000 cubic centimeters) (A) 0.80 (B)1.25 (C)8.00 (D)12.50 (E)80.00
不太明白问题的意思 答案是B
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A hiker walking at a constant rate of 4 miles per hour is passedby a cyclist traveling in the same direction along the same path at a constantrate of 20 miles per hour. The cyclist stopsto wait for the hiker 5 minutes after passing her, while the hiker continues towalk at her constant rate. How manyminutes must the cyclist wait until the hiker catches up? 这里我算的是这样子的：
首先 在5min, both hiker and cycilst traveled 20, and 100 mils respectively.
so C supersede H for 80 mils. so C stopped and waited for H.
所以这里80/4 得到20 分钟
不知道对不对
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112. 11750-!-item-!-187;#058&008431 For a certain race, 3 teams were allowed to enter 3 memberseach. A team earned 6 - n pointswhenever one of its members finished in nth place, where 1 <= n <=5. There were no ties,disqualifications, or withdrawals. If noteam earned more than 6 points, what is the least possible score a team couldhave earned? (A) 0 (B) 1 (C) 2 (D) 3 (E) 4
这道题很经典。求一个解题思路。
谢谢
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发表于 2013-7-19 19:02:21
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