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SAT官方每日一题：2012年4月15日

2012-04-21来源:互联网

　　2012年04月15日

　　考试类型: Mathematics > Standard Multiple Choice

　　Read the following SAT test question and then click on a button to select your answer.

　　A train travelingmiles per hour forhour covers the same distance as a train travelingmiles per hour for how many hours?

正确答案:B

解析:

When the speed of a train in miles per hour is multiplied by the travel time in hours, the distance traveled by the train is obtained. The distance that the first train travels is miles per hour times hour, which is miles. Using the variable for the travel time, in hours, of the second train, the distance that the second train travels is miles per hour times hours, which is 30 times x miles. Since the two trains travel the same distance, 60 = 30 times x , which gives x = 2 hours, the travel time of the second train.