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For how long is the whole of the train in the figure inside the tunnel?

Competition practiceProblems on Trains
  • A140 s
  • B80 s
  • C60 s
  • D20 s

Step-by-Step Solution

54 km/h m/s. The whole train is inside from when its rear enters to when its engine leaves: m → 20 s. (140 s is the time some part of it is inside.)
Answer: D) 20 s

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