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1. |
A steamer moves with a speed of 4.5 km/h in still water to a certain upstream point and comes back to the starting point in a river which flows at 1.5 km/h. The average speed of steamer for the total journey is |
A. | 12 km/h |
B. | 10 km/h |
C. | 6 km/h |
D. | 4 km/h |
Answer» E. | |