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      Question

      A bus driver drives at 45 km/h and is supposed to reach

      in 2 hours. He stops for 30 minutes after halfway. What speed is needed for the rest of the trip?
      A 75 km/h Correct Answer Incorrect Answer
      B 80 km/h Correct Answer Incorrect Answer
      C 85 km/h Correct Answer Incorrect Answer
      D 90 km/h Correct Answer Incorrect Answer

      Solution

      Total distance = 45 Γ— 2 = 90 km
      Half time = (45 Γ· 45) Γ— 60 = 60 minutes
      Time left = 120 – 60 – 30 = 30 minutes
      Required speed = (45 Γ· 30) Γ— 60 = 90 km/h

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