1.

An aeroplane flys around squares whose all sides are of length `100` miles. If the aeroplane covers at a speed of `100 mph` the first side, `200 mph` the second side `300 mph` the third side and `400 mph` the fourth side. The average speed of aeroplane around the square isA. `190mph`B. `195mph`C. `192mph`D. `200mph`

Answer» Correct Answer - C
`(c )` `"Average speed"=H.M`
`(4)/((1)/(100)+(1)/(200)+(1)/(300)+(1)/(400))=192`


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