Question 99579
 A passenger train going 50 miles per hour meets and passes another passenger train which is traveling in the opposite direction at exactly the same speed. A young woman riding in the train looks out the window, and notes that it takes 5 seconds for the train to pass by hers.
How long is the other train?
:
Relative speed; you can think of this as a train passing a fixed point at 100 mph
:
The length of the train would be how far it will travel in 5 sec at 100 mph
:
3600 sec in 1 hr
:
Length of train: 100 * {{{5/3600}}} = 500/3600 = .139 miles or 733.33 ft