Train A running at a speed of 45 km/hr crosses train B in 30 seconds. Find the speed of train B (in km/hr), if the sum of the length of train A and B is 550 meters and both trains running in the opposite direction.
Let speed of train B be ‘x’ km/hr. According to question, => 30(45 + x) × (5/18) = 550 => 1350 + 30x = 1980 => 30x = 630 => x = 21 km/hr
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