1. Two electric trains A and B leave the same station on parallel lines. The train A starts from rest with a uniform acceleration of 0.2 m/s2 and attains a speed of 45 kmph which is maintained constant afterwards. The train B leaves 1 minute after with a uniform acceleration of 0.4 m/s2 to attain a maximum speed of 72 kmph which is maintained constant afterwards. When will the train B overtake the train A?
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