Question

A train 800 metres long is running at a speed of 78 km/hr. If it crosses a tunnel in 1 minute, then the length of the tunnel (in meters) is :

A) 130 B) 360 C) 500 D) 540

Answer 1

Answer:

Let the tunnel be x meters long

So the speed of train=78km/h=78×5/18= 65/3 m/s

Time taken: 1 min=60 sec

Distance covered would be= x+800

because to cross the tunnel, the train must cover the distance equal to the sum of its length and tunnel's length.

Now applying Speed=Distance/Time:

65/3 = x+800/60

x+800=65×20

x=1300–800

x=500 km

So the length of the tunnel is equal to 500 km or 5 × 10^5 metres.

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Answer 2

Answer:

500 meter

Step-by-step explanation:

800×5/18=4000/18 (1 second)

4000/18×60=1300 (1 minute)

1300-800=500 meters