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Two trains are each 50 m long moving parallel towards each other at speeds $10 m/s$ and $15 m/s$ respectively. After what time will they pass each other?
Explanation
Relative speed of each train with respect to each other be, $v = 10 + 15 = 25 m/s$ Here distance covered by each train = sum of their lengths = $50 + 50 = 100 m$ $\therefore$ Required time = $100/25 = 4\text{sec}$.