SSC GD Constable 4 Feb 2025 Shift 2 Paper

Total distance covered when two trains cross each other = Length of Train 1 + Length of Train 2
Relative speed when two trains move in opposite directions = Speed of Train 1 + Speed of Train 2
Distance $=$ Speed × Time
Calculation:
Relative speed $=60\mathit{k}\mathit{m}∕\mathit{h}+110\mathit{k}\mathit{m}∕\mathit{h}=170\mathit{k}\mathit{m}∕\mathit{h}$
⇒ Relative speed in m/s $=170\times \left(1000∕3600\right)=170\times \left(5∕18\right)\mathit{m}∕\mathit{s}$
⇒ Total distance covered $=$ Relative speed × Time $=170\times \left(5∕18\right)\mathit{m}∕\mathit{s}\times 21\approx 991.66\mathit{m}$
⇒ Length of Train 2 = Total distance covered - Length of Train 1
⇒ Length of Train $2=991.66-360\approx 631.66\mathit{m}$