[問題]考古題 PS Form22 sec4-Q20

[iamger0730]

jeff drove to school from his home, averaging 40 miles per hour, and was 12 minutes late. The next day, he left home for work took the same route,averaging 48 miles per hour,and was 7 minutes late. How far in miles is it from Jeff's home to work?

a.20
b.24.5
c.30
d.37.5
e.40
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the answer is (a)

who can help me!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!(crying)

[65kevin]

由題目可知, 從家裡到學校的路程和從家裡去工作地點的路程一樣, 但是所花的時間多了5 分鐘, 令路程距離為 X , 可列出數學式 : X/(40/60) - X/(48/60) = 5, X = 20, Ans is (A)