Algebra - Time, Distance, Speed

Question

A column of soldiers is approaching a bridge that is exactly 378 meters long. It takes the whole column 7 minutes to pass the first post at the beginning of the bridge. It takes the whole column of soldiers 25 minutes to clear up the entire bridge. The soldiers are moving at a constant speed. What is the length of the column of soldiers and at what speed did they move?

Answer 1

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Answer 2

Let S=length of the column and V be their speed.

S=7V is the equation for passing the first post.

378=25V is the equation for crossing the bridge, so V=378/25=15.12 m/min.

So S=7*15,12=105.84m.