Quantitative Aptitude Ques 671

Question: Person went from A to B at an average speed of x km/h and returned from B to A at an average speed of y km/h. What was his average speed during the journey?

Options:

A) $ \frac{x+y}{2xy} $

B) $ \frac{2}{x+y} $

C) $ \frac{2xy}{x+y} $

D) $ \frac{1}{x}+\frac{1}{y} $

Show Answer

Answer:

Correct Answer: C

Solution:

  • Average speed $ =\frac{Totaldistance}{Totaltime} $ $ =\frac{2}{\frac{1}{x}+\frac{1}{y}}=\frac{2}{\frac{x+y}{xy}}=\frac{2xy}{x+y} $
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