Problem-Solving and Data AnalysisHardTrain speed from its length and passing time
Problem-Solving and Data Analysis practice question
A train 200 metres long passes a signal post completely in 8 seconds. What is the speed of the train, in kilometres per hour?
Answer: 90
200 m in 8 s is 25 m/s, and 25 × 3.6 = 90 km/h.
Common wrong answers
- If you answered 25
- 25 is the speed in metres per second.
- If you answered 1600
- 1600 multiplies 200 by 8.
- If you answered 0.09
- 0.09 is kilometres per second, roughly, mislabelled.
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