Question

a train crosses a bridge and a platform of length 650 m and 800m in 20 sec and 30sec respectively. Find the speed of the train.

Answer 1

Answer:

Let the length of the train be x m

Speed =

Speed =

Equating both the speeds

⇒ =

⇒ 3x + 2400 = 5x + 2000

⇒ 400 = 2x

⇒ x = 200

∴ The train length = 200 m

100 sec - 60sec = 800 m - 400 m

⇒ 40 sec = 400 m

Length of the train is

⇒ 60 sec - 40 sec = 20 sec

⇒ 20 sec = 400/2 = 200 m

∴ The train length = 200 m