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Train A, 120 m long, runs at 72 km/h and overtakes train B, 80 m long, in 20 seconds. If B doubled its speed while A kept to 72 km/h, how long would B take to overtake A?

Competition practiceProblems on Trains
  • AIt never would
  • B20 s
  • C10 s
  • D40 s

Step-by-Step Solution

Relative speed m/s, so B runs at m/s. Doubled, B runs at 20 m/s — exactly A's speed — so the gap never closes.
Answer: A) It never would

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