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A boat takes 30 minutes less to travel 18 km downstream than to travel the same distance upstream. If the speed of the stream is 3 kmph, find the speed of the boat. | |
A. | 15 kmph [Correct Answer] |
B. | 12 kmph [Wrong Answer] |
C. | 10 kmph [Wrong Answer] |
D. | 9 kmph [Wrong Answer] |