A race has three parts. The speed and time required to complete the individual parts for a runner is displayed on the following chart: Part I Part II Part III Speed (kmph) 9 8 7.5 Time (minutes) 50 80 100 What is the average speed of this runner?
Correct Answer: 8.00 kmph
Explanation:
Avg speed = Tot dist/Tot time = (45+64+75)/23 = 184/23
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