Question 580812
Coming from opposite directions, a freight train and a passenger train pass each other on parallel tracks.
 The passenger train travels at 60 mph. The freight train travels at 30 mph.
 A passenger observes that it takes 6 seconds to pass the freight train.
 How many feet long is the freight train?
:
Since they are going towards each other the speeds are additive: 60+30 = 90 mph
What is the distance (in feet) traveled in 6 sec at 90 mph
:
{{{(90*5280)/3600}}} * 6 = 792 ft is the length of the freight