[Q. ] 再一道pp
During a 40-mile trip, Maria travled at an average speed of X miles per hour
for the first y miles of the trip and at an average speed of 1.25 miles per
hour for the last 40﹣y miles of the trip. The time that Maria took to travel
the 40 miles was what percent of the time it would have taken her if she
had traveled at an average speed of x miles per hour for the entire trip?
(1) X=48
(2) Y=20
我選了C，但很不幸是個錯誤的答案。正確答案是B，但是當我使用Y＝20來計算兩者
的比例時還是無法將x消除。有請高手解釋。感激！！
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