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On parallel tracks, two trains approach each other at 40 km/h and 50 km/h. At what rate, in m/s, is the gap between them closing?

Competition practiceProblems on Trains
  • A2.8 m/s
  • B90 m/s
  • C324 m/s
  • D25 m/s

Step-by-Step Solution

Approaching each other, the speeds add: 90 km/h m/s. (2.8 m/s uses the difference.)
Answer: D) 25 m/s

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