Question: A sailor sails a distance of 48 km along the flow of a river in 8 h. If it takes 12 h to return the same distance, then the speed of the flow of the river is
Options:
A) 0.5 km/h
B) 1 km/h
C) 1.5km/h
D) 2 km/h
Show Answer
Answer:
Correct Answer: B
Solution:
- Let speed of the flow of water be v km/h and rate of sailing be u km/h.
Then, $ u+v=\frac{48}{8}=6 $
and $ u-v=\frac{48}{12}=4 $
On solving, we get
$ 2u=10 $
$ \Rightarrow $ $ u=5 $
$ \therefore $ $ v=6-5=1km/h $