Three boys are running on a equitriangular track with the same speed \( 5 \mathrm{~m} \mathrm{~s...

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Three boys are running on a equitriangular track with the same speed \( 5 \mathrm{~m} \mathrm{~s}^{-1} \). At start, they were
\( \mathrm{P} \) at the three corners with velocity along indicated directions. The velocity of approach of any one of them towards another at \( t=10 \mathrm{~s} \) equals
W
(1) \( 7.5 \mathrm{~m} \mathrm{~s}^{-1} \)
(2) \( 10 \mathrm{~m} \mathrm{~s}^{-1} \)
(3) \( 5 \mathrm{~m} \mathrm{~s}^{-1} \)
(4) \( 0 \mathrm{~m} \mathrm{~s}^{-1} \)
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