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Two particles \( \mathrm{P} \) and \( \mathrm{Q} \) simultaneously start moving
P from point \( A \) with velocities \( 15 \mathrm{~m} / \mathrm{s} \) and \( 20 \mathrm{~m} / \mathrm{s} \)

W respectively. The two particles move with accelerations equal in magnitude but opposite in direction. When \( \mathrm{P} \) overtakes \( \mathrm{Q} \) at \( \mathrm{B} \) then its velocity is \( 30 \mathrm{~m} / \mathrm{s} \). The velocity of \( \mathrm{Q} \) at point \( B \) will be
(1) \( 30 \mathrm{~m} / \mathrm{s} \)
(2) \( 5 \mathrm{~m} / \mathrm{s} \)
(3) \( 10 \mathrm{~m} / \mathrm{s} \)
(4) \( 15 \mathrm{~m} / \mathrm{s} \)
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