A) 8 km/h
B) 12 km/h
C) 14 km/h
D) 10 km/h
Correct Answer: D
Solution :
Speed downstream \[=\left( 30\times \frac{2}{5} \right)\text{km/h}=12\,\,\text{km/h}\] Speed upstream \[=\left( 30\times \frac{4}{15} \right)\text{km/h}=8\,\,\text{km/h}\] Speed of boat in still water \[=\frac{1}{2}(12+8)\text{km/h}=10\,\,\text{km/h}\]You need to login to perform this action.
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