[单选题]
A cable car at a ski resort carries skiers a distance of 6.8 km. The cab dp ujmipn) 5yk7(jovska:/ 02le whi66 ahykh/v-*wt ;tjuech moves the car is driven by a pulley with diameter 3.0 m. Assuming no slippage, how fast must the pulley rotate for the cable car to make the h y* tvauj- te/k6w6h;trip in 12 minutes?
A. $9.4 \; rpm$
B. $30 \; rpm$
C. $60 \; rpm$
D. $720 \; rpm$
Post time 2024-1-22 02:51:16