A cable car at Bukit Baidera carries passengers at a distance of 6.8 km. The cable which moves the car is driven by a pulley with a diameter of 3.0 m. Assuming no slippage, how fast (magnitude and unit) must the pulley rotate for the cable car to make the trip in 12 minutes? A. 30 B. 60 C. 720 D. gun

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