Question
450 metre long train βAβ is running with a speed of
99 km/hr. Train βBβ which is 555 metre long is running with a speed of 90 km/h in opposite direction of train βAβ. For how much time, the smaller train is completely obscured by the larger train when they cross each other?Solution
Length of smaller train = 450 metre Speed of smaller train = 99 Γ (5/18) = 27.5 m/s Length of bigger train = 555 metres Speed of bigger train = 90 Γ (5/18) = 27.5 m/s Since, the smaller train is completely obscured by larger train, therefore, extra length of larger train = 555 β 450 = 105 metres Relative speed of trains βAβ and βB β= 27.5 + 25 = 52.5 m/s (Since, the trains are running in opposite direction) Required time = 105/52.5 = 2 second
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