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Trains 100 m and 150 m long cross each other in 10 seconds when running in opposite directions and in 30 seconds when running the same way. If the slower train doubled its speed, how long would the opposite-direction crossing take?

Competition practiceProblems on Trains
  • A7.5 s
  • B5 s
  • C15 s
  • D10 s

Step-by-Step Solution

Sum m/s, difference m/s → speeds and m/s. Doubling the slower makes the sum m/s → s.
Answer: A) 7.5 s

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