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 traveling
miles per hour for
hour covers the same distance as a train traveling
miles 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 
miles. Since the two trains travel the same distance, 
, which gives 
hours, the travel time of the second train.