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      Question

      A train crosses a signal post in 36 seconds and a tunnel

      of length 360 metres in 66 seconds. What is the train’s speed in km/h?
      A 43.2 km/h Correct Answer Incorrect Answer
      B 33.2 km/h Correct Answer Incorrect Answer
      C 63.2 km/h Correct Answer Incorrect Answer
      D 37.5 km/h Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      ATQ,

      Let the speed of train be 'v' m/s Length of train = 36v metres So, (36v + 360) ÷ 66 = v ⇒ 36v + 360 = 66v ⇒ 30v = 360 ⇒ v = 12 Speed of train = 12 m/s = 12 × (18/5) = 43.2 km/h

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