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      Question

      Speed of a car and a bus is 20 km/h and 10 km/h,

      respectively. If the time taken by the car to cover a distance of ‘9x’ km is 4 hour less than time taken by the bus to cover a distance of ‘5x’ km, then find the value of ‘9x’
      A 700 Correct Answer Incorrect Answer
      B 730 Correct Answer Incorrect Answer
      C 750 Correct Answer Incorrect Answer
      D 720 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      According to the question, (5x/10) – (9x/20) = 4 Or, (5x × 2 – 9x × 1) ÷ 20 = 4 Or, (10x – 9x) ÷ 20 = 4 So, x = 80 Required value = 9 × 80 = 720

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