Briefly

The train through the tunnel

The train through the tunnel

A 100-meter-long train crosses a 100-meter-long tunnel at a speed of 100 meters per minute.

How long will it take for the train to completely cross the tunnel?

Solution

It will take 2 minutes in completely crossing the tunnel. The machine will take a minute to reach the other end of the tunnel and it will take another minute to exit in the last car.