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      Question

      A boy goes to school with a speed of 65 km/h and comes

      back with a speed of 35 km/h. find his average speed?
      A 48 km/hr Correct Answer Incorrect Answer
      B 36 km/hr Correct Answer Incorrect Answer
      C 37.5 km/hr Correct Answer Incorrect Answer
      D 45.5 km/hr Correct Answer Incorrect Answer

      Solution

      Since the distance travelled by a boy (going to school and coming back from school) is equal. So, average speed = 2xy/(x + y) Average speed = (2 x 65 x 35)/(65 + 35) Average speed = (2 x 65 x 35)/100 = 45.5 km/hr

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