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State PCS PYQPrelims 2022

BPSC – Combined Competitive Examination · Question 90

A 140 m long train runs at 60 km/h and a dog runs parallel in the same direction at 18 km/h. The train will pass the dog in:

  1. 11 seconds
  2. 12 seconds
  3. 12.5 seconds
  4. 10 seconds
  5. None of the above / More than one of the above
Show answer & explanation

Answer: (B) 12 seconds

Explanation

Same direction: relative speed = 60 − 18 = 42 km/h = 11.67 m/s; time = 140/11.67 = 12 s.

  • (A) Incorrect

    Wrong: incorrect.

  • (B) Correct

    Correct: relative speed 42 km/h = 35/3 m/s; 140 ÷ 35/3 = 12 s.

  • (C) Incorrect

    Wrong: incorrect.

  • (D) Incorrect

    Wrong: incorrect.

  • (E) Incorrect

    Wrong: only one of the options A–D is correct.