Question

31. If one good's carrier train runs at speed of 18 km/hour. If the length of train is 400m. Then
how much time it will required for the train to cross the signal pole?
1) 40 Sec. 2) 1 Min 18 Sec. 3) 1 Min 20 Sec. 4) 1 Min
18​

Answer 1

Given data : One goods carrier train runs at speed of 18 km/hour. If the length of train is 400 m.

To find : How much time it will required for the train to cross the signal pole ?

Solution :

• Speed of train = 18 km/hour
• Length of train = 400 m

Now we need to convert speed of train km/hour into m/s.

⟹ Speed of train = 18 km/hour

⟹ Speed of train = {18 * 1000}/{60 * 60} m/s

⟹ Speed of train = 18000/3600 m/s

⟹ Speed of train = 180/36 m/s

⟹ Speed of train = 10/2 m/s

⟹ Speed of train = 5 m/s

To find time taken by train to cross the signal pole we use formula :

⟹ Speed of train = length of train/time taken by train

⟹ 5 = 400/time taken by train

⟹ time taken by train = 400/5

⟹ time taken by train = 80 sec

Here we know, 80 sec mean 1 min 20 sec.

Hence, good's carrier train take 1 min 20 sec to cross signal pole.

Answer : 3) 1 m 20 sec.

Answer 2

Answer:

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