Question

an express train passes a tunnel in 21 sec .the length of a train is 130 m and moving at a speed of 90km/hr .what is the length of a tunnel

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Answer 1

Answer:

HAPPY MAKAR SANKRANTI

Answer 2

Step-by-step explanation:

Given,

Speed of the train = 90km/h = 90 X 5/18 =25m/s

Length of the train = L = 130 m

Train passes tunnel in 21 sec

Let, the length of the tunnel = T = y metre

Now,

During passing tunnel total distance covered

= Length of train + Length of tunnel

= L + T

= (130 + y) m

Time taken to pass tunnel = 21 sec

Speed of train during passing tunnel = 25m/s

Now,

Distance travelled= Speed X Time

130 + y = 25 X 21

130 + y = 525

y = 525 - 130

y = 395 m

So, the length of tunnel is 395 m.