実際の問題6

John travels to Gotham everyday for his work. His wife picks him up at the train
station each evening at exactly 6 PM. One day, he left work early, and arrived at
the train station at 5 PM. He started walking home, but he met his wife en route
to the station and got into the car. They drove home and arrived 10 minutes
earlier than usual. How long did the man have to walk before he was picked up
by his wife?

55 minutes
45 minutes
35 minutes
25 minutes
57 minutes
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まさしは日暮里に毎日出勤している。かわいい奥さんは毎日午後6時きっかりに駅に
迎えに行く。ある日、まさしは仕事が早く終わり、5時に駅についてしまった。家に向かって
歩き始めたが、途中で迎えに来た奥さんにばったり会って車に乗って戻り、家に着いた
時間はいつもより10分早かった。まさしは、奥さんに会うまで何分歩いたか。