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Speed of train A = 18 × 5/18 = 5 m/s Length of train A = 5 × 8 = 40 metres Let length of train B = ‘l’ metres Speed of train B = 54 × 5/18 = 15 m/s Relative speed if train A with respect to train B = 15 + 5 = 20 m/s So, I + 40 = 20 × 10 = 200 So, l = 160 metres
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