A train, 800 meter long is running with a speed of 78 km/hr. It crosses a tunnel in 1 minute. What is the length of the tunnel ?

Question

A train, 800 meter long is running with a speed of 78 km/hr. It crosses a tunnel in 1 minute. What is the length of the tunnel ?

A. 650 meter

B. 555 meter

C. 500 meter

D. 458 meter

Let length of tunnel is x meter
Distance = 800+x meter
Time = 1 minute = 60 seconds
Speed = 78 km/hr = 78*5/18 m/s = 65/3 m/s
Distance = Speed*Time

\Rightarrow 800 + x = \frac{65}{3} \times 60 \Rightarrow 800 + x = 20 \times 65 = 1300 \Rightarrow x = 1300 - 800 = 500

So the length of the tunnel is 500 meters.

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Accepted Answer

C. 500 meter

A train, 800 meter long is running with a speed of 78 km/hr. It crosses a tunnel in 1 minute. What is the length of the tunnel ?

Correct Answer :

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