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DS：In planning for a trip, Joan estimated both the distance ofthe trip, in miles, and her average speed, in miles per hour. She accurately divided her estimated distanceby her estimated average speed to obtain an estimate for the time, in hours,that the trip would take. Was herestimate within 0.5hour of the actual time that the trip took?
（1） Joan’s estimate for the distance was within 5 miles of the actualdistance.
（2）Joan’s estimate for her average speed waswithin 10 miles per hour of her actual average speed.
题目问的是是否估计与实际小于0.5H 根据两个条件 确实小于0.5H啊 可是答案是E |
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发表于 2011-10-11 06:28:33
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