Question

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​

Answer 1

(210+x)×18/(90-72)×5=55

(210+x)×18/(18×5)=55

(210+x)=55×5

X=275-210

X=65m