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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 mh^(-1)` the first side, at `200 mh^(-1)` the second side, at `300 mh^(-1)` the third side and `400mh^(-1)` the fourth side. The average speed of aeroplane around the square is (in `mh^(-1)`)

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The correct Answer is:
`192.00`
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