If velocity of block \( B \) in the given arrangement is \( 300 \mathrm{~mm} / \) sec towards ri...

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If velocity of block \( B \) in the given arrangement is \( 300 \mathrm{~mm} / \) sec towards right. Then velocity of \( A \) will be
(a) \( 200 \mathrm{~mm} / \mathrm{sec} \)
(b) \( 100 \mathrm{~mm} / \mathrm{sec} \)
(c) \( 450 \mathrm{~mm} / \mathrm{sec} \)
(d) \( 150 \mathrm{~mm} / \mathrm{sec} \)
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