Answer:
Speed of train = 72 km/h and length of train = 100m.
Step-by-step explanation:
Let, length of the train is = L m.
Time taken to cross an electric pole = 5 sec.
Time taken to cross a railway bridge of 600 m long = 35 sec.
While crossing the electric pole train covers distance = L m.
While crossing the railway bridge train covers distance = L + 600 m.
By using the formula,
Speed = Distance / Time
Speed of train = [tex]\frac{L}{5} = \frac{L + 600}{35}[/tex]
[tex]35L = 5L + 3000\\30L = 3000\\L = 100[/tex]
So, length of train = 100 m.
Speed of train = [tex]\frac{100}{5}[/tex]
[tex]= 20 m/s\\= \frac{20*3600}{1000} km/h\\ =72 km/h[/tex]
So, speed of train = 72 km/h.