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1. |
A boat takes 9 h to travel a distance upstream and taken 3 h to travel the same distance downstream. If the speed of the boat in still water is 4 km/h, then what is the velocity of the stream ? |
A. | 4 km/h |
B. | 3 km/h |
C. | 6 km/h |
D. | 2 km/h |
Answer» E. | |