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     EduGorilla 
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    If the edge of a cube is changing @ 3.15 cm/sec, the rate of change of its longest diagonal will be (approx.)

    Options :-

    1. 4.9 cm/sec
    2. 4.5 cm/sec
    3. 5.45 cm/sec
    4. 6.45 cm/sec
    5. none of these
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