| A man can row 9 km/h in still water. It takes him twice as long to row up as to row down the river. Find the speed of stream. |
A) 3 km/h
B) 4 km/h
C) 5 km/h
D) 6 km/h
E) None of the above
Correct Answer: A
Solution :
| Let x be the speed of stream, |
| \[9+x=2\,(9-x)\]\[\Rightarrow \,\]\[9+x=18-2x\] |
| \[\Rightarrow \] \[3x=18-9=9\]\[\Rightarrow \,\]\[x=3\,km/h\] |
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