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      Question

      A person travels at the equivalent triangle area along

      with the plains of the triangular area, at 18 kmph, 24 km, and 36 kmph. Tell the average speed of travel.
      A 22kmph Correct Answer Incorrect Answer
      B 24kmph Correct Answer Incorrect Answer
      C 18kmph Correct Answer Incorrect Answer
      D 34kmph Correct Answer Incorrect Answer

      Solution

      Let the side of the triangle be 72 km. As we know, Average speed = total distance/total time Time to cover 72 km distance with the speed of 18 km/hr = 72/18 = 4 hrs Time to cover 72 km distance with the speed of 24 km/hr = 72/24 = 3 hrs Time to cover 72 km distance with the speed of 36 km/hr = 72/36 = 2 hrs Average speed = (3 x 72)/ (4 + 3 + 2) = 216/9 = 24 km/hr

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