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Let the length of the platform be ‘x’ metres Let the length of trains ‘M’ and ‘N’ be ‘a’ metres and ‘b’ metres, respectively According to the question, 72 × 5/18 = (x + a)/32 20 × 32 = x + a Or, x + a = 640 Or, x = 640 – a.….. (1) Also, 90 × 5/18 = (x + b)/24 25 × 24 = x + b Or, x + b = 600 Or, x = 600 – b…… (2) From equations (1) and (2), we get 640 – a = 600 – b Or, a – b = 40 Therefore, required ratio cannot be determined. Hence, option d.
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