SSC Sample Paper Mock Test-7 SSC CGL Tear-II Paper-1

A train passes two bridges of lengths 800 m and 400 m in 100 s and 60 s respectively. The length of the train is

A) 80 m

B) 90 m

C) 200 m

D) 150 m

Correct Answer: C

Solution :

Let the length of train be x metres.

As given,

\[\text{Speed}=\frac{x+800}{100}\] ...(i)

\[\text{Speed}=\frac{x+400}{60}\] ...(ii)

\[\therefore \] \[\frac{x+800}{100}=\frac{x+400}{60}\]

\[\Rightarrow \] \[\frac{x+800}{5}=\frac{x+400}{3}\]

\[\Rightarrow \] \[5x+2000=3x+2400\]

\[\Rightarrow \] \[2x=400\]

\[\Rightarrow \] \[x=\frac{400}{2}=200\,\,\text{m}\]