A moving object completes 1/3 of a journey with an average speed of 2 km/h and another 1/3 with an average speed of 8 km/h. Given that the entire trajectory is straight and the average speed of the object over the entire journey was 4 km/h, determine the average speed, in km/h, for the last 1/3 of the journey. A - 4 km/h B - 5 km/h C - 6 km/h D - 7 km/h E - 8 km/h
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Each segment of the journey is \( \frac{D}{3} \) km. Show more…
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