An express train is moving with a velocity $v_1$. Its driver finds another train moving on the same track in the same direction with velocity $v_2$. To escape a collision,the driver applies a retardation $a$ to the train. The minimum time to escape a collision will be:
- A$t = \frac{v_1 - v_2}{a}$
- B$t = \frac{v_1^2 - v_2^2}{2a}$
- CNone
- DBoth
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