Question: 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.
Options:
A) 3 km/h
B) 4 km/h
C) 5 km/h
D) 6 km/h
E) None of the above
Show Answer
Answer:
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 $