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ATQ, Length of train A = d, length of train B = d+200. Train A crosses a 300 m bridge, and Train B crosses a 500 m platform in equal time. Speed ratio: Train A to Train B = 5:9. Set up time equations: 
Cross-multiply = 9(d+300)=5(d+700) Simplify: 4d = 800, So, d = 200.
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