What is the time it takes for a passenger to pass through a tunnel if the speed of the train is given?

To determine the time it takes for a passenger to pass through a tunnel, the most relevant relationship is derived from the fundamental formula for time, which is time equals distance divided by speed. In this context, the distance that needs to be covered for a passenger to completely pass through the tunnel is equal to the length of the tunnel itself. Therefore, when calculating the time, the distance (length of the tunnel) is divided by the speed of the train.

By applying this logic, the correct formula to find the time taken is simply the length of the tunnel divided by the speed of the train, which aligns perfectly with the correct answer. This approach clearly expresses the relationship required to find the time needed for a passenger to clear the tunnel entirely.

Understanding this concept also helps clarify that the other options do not address the necessary calculation for the time required to traverse the tunnel effectively.