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      Question

      A person covered 80 km at a speed of 'z' km/h and then

      another 100 km at a speed of (3z/2) km/h. If the total time taken for the journey was 320 minutes, find the value of 'z'.
      A 27.5 km/h Correct Answer Incorrect Answer
      B 45.5 km/h Correct Answer Incorrect Answer
      C 56.6 km/h Correct Answer Incorrect Answer
      D 20.5 km/h Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      ATQ,

      Image

      So, z = (440 × 3) ÷ (3 × 16) = 27.5 km/h

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