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A Long Train
A train moving at 45 miles per hour meets and
is passed by a train going 36 mph the other way.
A passenger in the first train see the second
train takes 6 seconds to pass him.
How long is the second train?
The speed of the passenger in the first train relative to the second train is 45 + 36 = 81 mph.
Then you take the number of feet in a mile(5280) and multiply it by 81.
Then you must convert the time to seconds
by dividing the product by 3600(the amount of seconds in one hour).
Your speed per second is your resultant(118.8 feet per second.)
It takes 6 second for the second train to pass.
So the length of the second train is 6 X 118.8 = 712.8 feet long.
Which equals 0.135 miles.
