Quantitative Aptitude Ques 1975

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) 5 km/h

C) 1.5 km/h

D) 2 km/h

Show Answer

Answer:

Correct Answer: B

Solution:

  • Let speed of the flow of river be $ xkm/h $ and rate of sailing of sailer be $ ykm/h. $ Downstream speed $ (x+y)=\frac{48}{8} $

$ \Rightarrow $ $ (x+y)=6 $ … (i) and upstream speed $ (x-y)=\frac{48}{12} $

$ \Rightarrow $ $ x-y=4 $ … (ii) On solving Eqs. (i) and (il), we get $ x=5km/h $

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