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      Question

      Car β€˜A’ can cross a 560 metre long bridge in 14

      seconds. Car β€˜A’ is 90 metres ahead of car β€˜B’ which is travelling in the same direction as that of car β€˜A’ with a speed of 50 m/s. After how many seconds will car β€˜B’ meet car β€˜A’?
      A 6 seconds Correct Answer Incorrect Answer
      B 9 seconds Correct Answer Incorrect Answer
      C 12 seconds Correct Answer Incorrect Answer
      D 15 seconds Correct Answer Incorrect Answer

      Solution

      Speed of car β€˜A’ = 560 Γ· 14 = 40 m/s So, relative speed of car β€˜B’ with respect to car β€˜A’ = 50 – 40 = 10 m/s Distance between the two cars = 90 metres So, time taken by car β€˜B’ to meet car β€˜A’ = 90 Γ· 10 = 9 seconds

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