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      Question

      A man travels some distance at a speed of 20 km/hr and

      returns at a speed of 15 km/hr. If the total time taken by him is 3 hrs 30 min, the distance is
      A 20 km Correct Answer Incorrect Answer
      B 36 km Correct Answer Incorrect Answer
      C 15 km Correct Answer Incorrect Answer
      D 30 km Correct Answer Incorrect Answer

      Solution

      Let the distance travelled by a man be D km According to the question, Total time taken = 2 hrs 30 min = 3(30/60) = 7/2 hours Total time = T1 + T2 D/20 + D/15 = 7/2 (3D + 4D)/60 = 7/2 7D/60 = 7/2 D = 30 km

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