Step-by-step explanation:
Given:
Time to cross the pole = 5 sec
Time to crosses the tunnel = 20 sec
Formula used:
Speed = Distance/Time
Calculation:
Let the length of the tunnel be x m and the length of the train be y m
Time = Distance/Speed
⇒ 5 = (y/90)
⇒ y = 450 m
Time to crosses the tunnel = Distance/Speed
⇒ 20 = (y + x)/90
⇒ 20 × 90 = (450 + x)
⇒ x = 1800 - 450 = 1350
∴ The length of the tunnel is 1350 m.
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Author:
mateyq8cf
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20Answer:
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.
Author:
pebbles9i94
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