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An aeroplane flies along the four sides of a square at a speed of 100, 200, 300 and 400 km/h, respectively. What is the average speed of the plane in its flight around the square?

A) 196 km/h
B) 200 km/h
C) 250 km/h
D) None of the above.

Correct Answer:




D) None of the above.

Description for Correct answer:

Average speed = \( \Large \frac{Total \ distance}{Total \ time} \)

\( \Large \frac{x+x+x+x}{ \LARGE \frac{x}{100}+\frac{x}{200}+\frac{x}{300}+\frac{x}{400}} \)

\( \Large \frac{4x}{ \LARGE \frac{12x+6x+4x+3x}{1200}} \)

\( \Large \frac{4x \times 1200}{25x} = 192 km/h \)

Part of solved Average questions and answers : >> Aptitude >> Average

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