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      Question

      A man must travel 600 km in 12 hours. If he traveled the

      first 40% of the journey at a constant speed of 80 km/h, at what speed must he travel the remaining distance so that he finishes the journey on time?
      A 50 km/h Correct Answer Incorrect Answer
      B 45 km/h Correct Answer Incorrect Answer
      C 25 km/h Correct Answer Incorrect Answer
      D 40 km/h Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      ATQ, 40% of 600 = 240 km Time taken to travel 240 km = 240 ÷ 80 = 3 hours Remaining distance = 600 - 240 = 360 km Remaining time = 12 - 3 = 9 hours So, speed at which remaining distance is to be traveled = 360 ÷ 9 = 40 km/h

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