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1. |
A motorboat, whose speed in 15 km/hr in still water goes 30 km downstream and comes back in a total of 4 hours 30 minutes. The speed of the stream (in km/hr) is: |
A. | 10 |
B. | 6 |
C. | 5 |
D. | 4 |
Answer» D. 4 | |