Train A running at a speed of 36 km/hr crosses train B in 20 seconds. Find the speed of train B (in km/hr), if the sum of the length of train A and B is 400 meters and both trains running in the opposite direction.
Let speed of train B be ‘x’ km/hr. According to question, => 20(36 + x) × (5/18) = 400 => 720 + 20x = 1440 => 20x = 720 => x = 36 km/hr
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