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      Question

      A train passes two persons who are walking in the opposite direction of the train at the rates of 4 m/s and 10 m/sec in 10 seconds and 8 seconds respectively. What is the speed of the train?

      A 15 m/s Correct Answer Incorrect Answer
      B 20 m/s Correct Answer Incorrect Answer
      C 40 m/s Correct Answer Incorrect Answer
      D 10 m/s Correct Answer Incorrect Answer

      Solution

      Speed of persons =4m/s and 10m/s. Time =10sec and 8sec. Let the Speed of the train =x ATQ- D /(4+x) =10              … (1) D/(10+x) =8               … (2) 40+10x =80+8x 2x =40 X =20m/s.

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