One third of a certain journey is covered at the speed...

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One third of a certain journey is covered at the speed of 80 km/hr one fourth of the journey at the speed of 50 km/hr and the rest at the speed of 100 km/hr what will be the average speed (in km/hr) for the whole journey?

A. 75

B. 67

C. 66.66

D. 76.66

Answer: Option A

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