Brain Teasers
Delayed Trains
Mrs. John grumbles about bad time-keeping trains like everybody else. On one particular morning she was justified, though. The train left on time for the one hour journey and it arrived 5 minutes late. However, Mrs. John's watch showed it to be 3 minutes early, so she adjusted her watch by putting it forward 3 minutes. Her watch kept time during the day, and on the return journey in the evening the train started on time, according to her watch, and arrived on time, according to the station clock. If the train traveled 25 percent faster on the return journey than it did on the morning journey, was the station clock fast or slow, and by how much?
Answer
The station clock is 3 minutes fast. The morning journey took 65 minutes, and the evening journey therefore took 52 minutes, and the train arrived 57 minutes after it should have left, that is, 3 minutes early.Hide Answer Show Answer
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