A) 8 km/h
B) 10 km/h
C) 15 km/h
D) 12 km/h
Correct Answer: D
Solution :
Speed of boat in still water \[=\frac{1}{2}(\text{Rate downstream+Rate upstream})\] \[=\frac{1}{2}(15+9)\] \[=\frac{1}{2}\times 24=12\,\text{km/h}\]
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