Question: A man can row at 5 km/h in still water. If the velocity of current is 1 km/h and it takes him 1 h to row to a place and comes back. How far is the place?
Options:
A) 2.5 km
B) 3 km
C) 2.4 km
D) 3.6 km
Show Answer
Answer:
Correct Answer: C
Solution:
- Let the distance be x km.
Speed upstream $ =5-1=4km/h $
Speed downstream $ =5+1=6km/h $
According to the question,
$ \frac{x}{6}+\frac{x}{4}=1 $
$ \Rightarrow $ $ 2x+3x=12 $
$ \Rightarrow $ $ 5x=12,\Rightarrow x=2.4,km $