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      Question

      Bike β€˜A’ is 150 metres ahead of bike β€˜B’. Bike

      β€˜A’ is travelling at 16 m/s and bike β€˜B’ is travelling at 54 km/h. If both bikes are moving in the same direction, how long will bike β€˜B’ take to overtake bike β€˜A’?
      A 65 secs Correct Answer Incorrect Answer
      B 42 secs Correct Answer Incorrect Answer
      C 30 secs Correct Answer Incorrect Answer
      D Can't be determined Correct Answer Incorrect Answer

      Solution

      Speed of bike β€˜B’ = 54 Γ· 3.6 = 15 m/s
      So, relative speed of bike β€˜B’ with respect to bike β€˜A’ = 15 – 16 = –1 m/s
      Since the relative speed is negative, bike β€˜B’ will never overtake bike β€˜A’.

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