If the time taken by a 170 m long train travelling at a certain speed to cross a 180 m long stationary train is 15 s, then the speed of the train is

Given:

Length of the moving train = 170 m

Length of the stationary train = 180 m

Time taken to cross = 15 s

Formula used:

Speed = Total distance / Time

Calculation:

Total distance covered = Length of moving train + Length of stationary train

⇒ Total distance = 170 + 180 = 350 m

Speed = Total distance / Time

⇒ Speed = 350 ÷ 15

⇒ Speed = 23.33 m/s

∴ The correct answer is option (4).