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BPSC (Bihar PCS) 2022 · Question 106 of 150

A train of length 140 m is running at a speed of 60 km/hr and a dog is running in the same direction parallel to the train at a speed of 18 km/hr. The train will cross the dog in

Mental Ability

  1. A11 seconds
  2. B12 secondsCorrect
  3. C12 1/2 seconds
  4. D10 seconds
  5. ENone of the above/More than one of the above

Answer: B. 12 seconds

Explanation

Relative speed is 60 - 18 = 42 km/hr = 35/3 m/s; time = 140 / (35/3) = 12 seconds.

Source: 67th BPSC Prelims Re-Exam 2022 (Set D)

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