Excluding stoppages, the average speed of a bus is $80 \text{ km/h}$ and including stoppages, it is $64 \text{ km/h}$. For how many minutes does the bus stop per hour?
Options:
- A: $10 \text{ min}$
- B: $12 \text{ min}$
- C: $15 \text{ min}$
- D: $16 \text{ min}$
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