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ATQ,
Let the length of train A = LA and length of train B = LB respectively, Speed of train A = 3x, Speed of train B = 2x.
From the problem:
Substitute LB = 600 − LA into the equation and simplify: 2LA − 3LB − 120 = 18x,
Solve to get LA = 18x/5 + 384. Use this relation to calculate 'x' or LA with additional constraints or assumptions about 'x' is not mention Hence, it Can't be determined
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