Quantitative Aptitude Ques 973

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 $