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				| 1. | 
                                    Q: Excluding stoppages, the average speed of a bus is 60 km/hr and including stoppages, the average speed of the bus is 40 km/hr. For how many minutes does the bus stop per hour ? | 
                            
| A. | 2 hrs | 
| B. | 20 min | 
| C. | 40 min | 
| D. | 30 min | 
| Answer» C. 40 min | |