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

Two wheels of M.I. 3 kg `m^(2)` and 5 kg `m^(2)` are rotating at the rate of 600 rpm and 800 rpm respectively in the same direction. If the two are coupled so as to rotate with the same axis of rotation, the resultent speed of rotation will be (in rpm).

A

725

B

850

C

420

D

630

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The correct Answer is:
A
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