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One third of a certain journey is covere...

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

A. 75

B

B. 67

C

C. 66.66

D

D. 76.66

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