Length of smaller train = 150 metre Speed of smaller train = 32.4 × (5/18) = 9 m/s Length of bigger train = 218 metres Speed of bigger train = 90 × (5/18) = 25 m/s Since, the smaller train is completely obscured by larger train, therefore, extra length of larger train = 218 – 150 = 68 metres Relative speed of trains ‘A’ and ‘B ‘= 9 + 25 = 34 m/s (Since, the trains are running in opposite direction) Required time = 68/34 = 2 second
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