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      Question

      A person travels from the hostel to the college with a

      speed of 15 kmph from the bicycle and reaches a 4.5 minute delay. If he runs a bike with a speed of 20 kmph, then it reaches 4.5 minutes. Describe the distance between hostel and college. (In km)
      A 8 Correct Answer Incorrect Answer
      B 6 Correct Answer Incorrect Answer
      C 9 Correct Answer Incorrect Answer
      D 7 Correct Answer Incorrect Answer

      Solution

      Let us consider the time of journey be t hrs, As we know, the distance is same According to the question 15 (t + 4.5/60) = 20 (t-4.5/60)   3 (t + 3/40) = 4 (t-3/40) 3t+ 9/40 = 4t-12/40 4t-3t = 9/40 + 12/40   t = 21/40 Distance = speed × time   Distance = 15 (21/40 + 3/40) = 9 km

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