Beth is taking the train to see her boyfriend on valentine's day! the train is hundred m long and it takes 30 seconds to cross a 400 m bridge. what speed is the train going at?

16.67 m/s.

Step-by-step explanation:

We have been given that a train is 100 m long and it takes 30 seconds to cross a 400 m bridge.

We will use speed formula to solve our given problem.

We know that train has to cover the length of bridge and its own length to fully cross the bridge.

Time taken by train to cross the bridge = 30 seconds.

Upon substituting these values in speed formula we will get,

Therefore, the trains is going at a speed of 16.67 meters per second.

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