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An aeroplane flies around a square, the sides of which measure 100 miles each. The aeroplane covers at a speed of 100 mph the first side, at 200 mph the second side, at 300 mph the third side and 400 mph the fourth side. The average speed of the aeroplane around the square is

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200 mph

192 mph

195 mph

190 mph

answer is C.

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Detailed Solution

$d = 100 \times 4 = 400$

Average $= \frac{400}{\frac{100}{100} + \frac{100}{200} + \frac{100}{300} + \frac{100}{400}} = 192$

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