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      Question

      A motorcycle covered the first 60 km of its journey at

      an average speed of 40 km/h. The speed of the motorcycle for covering the rest of the journey, i.e. 90 km, was 45 km/h. During the whole journey, the overall average speed of the motorcycle was:
      A 1 Correct Answer Incorrect Answer
      B 2 Correct Answer Incorrect Answer
      C 3 Correct Answer Incorrect Answer
      D 4 Correct Answer Incorrect Answer

      Solution

      ATQ,

      First, find the time for each part of the journey: TimeтВБ = 60 ├╖ 40 = 1.5 h TimeтВВ = 90 ├╖ 45 = 2 h Total distance = 60 + 90 = 150 km Total time = 1.5 + 2 = 3.5 h Average speed = 150 ├╖ 3.5 = 42(6/7) km/h

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