Two-thirds of a certain distance was covered at the speed of...

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Two-thirds of a certain distance was covered at the speed of 45 km/h, one-fourth at the speed of 60 km/h and the rest at the speed of 75 km/h. Find the average speed per hour for the whole journey. (correct to 2 decimal places)

A. 51.25 km/h

B. 45.75 km/h

C. 58.25 km/h

D. 49.77 km/h

Answer: Option D

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