SSC CGL 2023 PYQ — Question 69

The correct answer is Option 4 i.e. 90 sec.

Length of first train, T₁ = 130 m

Speed of first train, S₁  = 40 km/h

Length of second train, T₂ = 120 m

Speed of second train, S₂ = 50 km/h

Relative speed of trains moving in same direction = Difference between the speeds of the two trains

Trains are running in the same direction

Relative speed = Speed of second train - Speed of first train = 50 - 40 = 10 km/h

⇒ 10 × $5\over 18$ = $25\over 9$ m/sec

Time = $distance\over speed$ = $(130 + 120)\over {25\over 9}$= 250/25/9 = 90 sec