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      Question

      Truck β€˜P’ is 180 metres ahead of truck β€˜Q’.

      Truck β€˜P’ is moving at 18 m/s and truck β€˜Q’ is moving at 72 km/h. How much time will truck β€˜Q’ take to overtake truck β€˜P’?
      A 65 secs Correct Answer Incorrect Answer
      B 42 secs Correct Answer Incorrect Answer
      C 90 secs Correct Answer Incorrect Answer
      D 50 secs Correct Answer Incorrect Answer

      Solution

      Speed of truck β€˜Q’ = 72 Γ· 3.6 = 20 m/s
      So, relative speed of truck β€˜Q’ with respect to truck β€˜P’ = 20 – 18 = 2 m/s
      So, time taken by truck β€˜Q’ to overtake truck β€˜P’ = 180 Γ· 2 = 90 seconds

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