Question

The length of the bridge, which a train 130 m long on travelling at 45 km/h can cross in 30 s, is

Options

• 200 m

•  225 m

• 245 m

• 250 m

Answer 1

245 m
Explanation:

Speed = `(45xx5/18) "m/s" = (25/2)`m/s

Time = 30 s.
Let, the length of the bridge be x m

Then, `(130+x)/30=25/2`

⇒ 2(130 + x) = 750

∴ x = 245 m