t train 210m long travelling at a 90km/hr overtook another train travelling in the same direction at 72km/hr and passes it completely in 55sec. what was the length if second train
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(210+x)×18/(90-72)×5=55
(210+x)×18/(18×5)=55
(210+x)=55×5
X=275-210
X=65m
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