A) 6 km/h
B) 2 km/h
C) 3 km/h
D) 4 km/h
Correct Answer: D
Solution :
Let man' rate upstream be x km/h. Then, man's rate downstream \[=2x\text{ km/h}\text{.}\] Man's rate in still water \[=\frac{1}{2}(2x+x)\text{km/h}=\frac{3x}{2}\text{km/h}\] \[\therefore \]\[\frac{3x}{2}=6\]\[\Leftrightarrow \]\[x=\frac{(2\times 6)}{3}=4\]You need to login to perform this action.
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