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      Question

      One person travels at a speed of 12 kmph on the surface of an equilateral triangle, 24 kmph and 8 kmph, Find the average speed of it. (In kmph)

      A 14 Correct Answer Incorrect Answer
      B 13 Correct Answer Incorrect Answer
      C 12 Correct Answer Incorrect Answer
      D 11 Correct Answer Incorrect Answer

      Solution

      Let, the side of the triangle be x km. As we know, Time to cover x km distance at a speed of 12 km/hr = x/12 hrs Time to cover x km distance at a speed of 24 km/hr = x/24 hrs Time to cover x km distance at a speed of 8 km/hr = x/8 hrs Total distance covered by the man = (x + x + x) = 3x Total time to cover the distance= (x/12 + x/24 + x/8) Average Speed =(3x) / (x/12 + x/24 + x/8) =3x /(6x/24) =12km/h.

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