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Two wheels of M.I. 3kgm^(2) and 5kgm^(2)...

Two wheels of M.I. `3kgm^(2)` and `5kgm^(2)` are rotating at a rate of `600` rpm and `800` rpm respectively in opposite directions. If they are coupled so as to rotated with the same axis of rotation , the resultant speed of rotation (in rpm)

A

`725`

B

`850`

C

`420`

D

`630`

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The correct Answer is:
A
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