The Long Tunnel

Logic Level 1

A train is one mile long. It travels at the rate of one mile a minute through a tunnel which is also one mile long.

How many minutes will it take for the train to pass completely through the tunnel?

1 2 3 Not enough information

Nashita Rahman by Nashita Rahman , 21, India

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2 solutions

Nashita Rahman
Jan 4, 2017

For the train to pass completely through the tunnel, it has to travel 2 miles. After 1 mile, the train would be completely in the tunnel and after another mile it would be completely out and since the train is travelling at 1 mile a minute , it will take 2 minutes to pass through the tunnel.

3 Helpful 0 Interesting 0 Brilliant 0 Confused
Achal Jain
Jan 4, 2017

The main thing to keep in mind while solving such problems is that we have to consider the length of the train too. Most of the people would consider the train as point object and their answer would be 1 instead of 2.;-)

2 Helpful 0 Interesting 0 Brilliant 0 Confused

The trick here is to draw a diagram. This question is little tricky.

A Former Brilliant Member - 4 years, 5 months ago

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