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      Question

      A man covers 250 km, 120 km, and 50 km at the speed of

      50 km/h, k km/h and 25 km/h, respectively. If his average speed for the whole journey is 42 km/h, then what is the value of k?
      A 45 Correct Answer Incorrect Answer
      B 35 Correct Answer Incorrect Answer
      C 36 Correct Answer Incorrect Answer
      D 40 Correct Answer Incorrect Answer

      Solution

      ATQ- Total distance =250+120+50=420km. Speed =50km/h, K km/h and 25km/h. 294k+5040 =420k 126k =5040 k =5040/126=40 k =40. 

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