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An express train is moving with a velocity \( v_{1} \). Its driver find another train is moving on the same
\( \mathrm{P} \) track in the same direction with velocity \( v_{2} \). To

W escape collision, driver applied a retardation \( a \) on the train. The minimum time of escaping collision \( \theta \) will be?
(1) \( t=\frac{v_{1}-v_{2}}{a} \)
(2) \( t=\frac{v_{1}^{2}-v_{2}^{2}}{a} \)
(3) None
(4) Both
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