SOLUTION: A passenger train traveled at a sped of 72km/h. A man on the passenger train observed a goods train traveling at a speed of 54km/h in the opposite direction. If the goods train pas

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Question 389200: A passenger train traveled at a sped of 72km/h. A man on the passenger train observed a goods train traveling at a speed of 54km/h in the opposite direction. If the goods train passed him in 8 seconds, find the length of the goods train.
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Relative to the man on the train, the 2 trains are moving apart
at the sum of their speeds, or 72+%2B+54+=+126 km/hr
Let s = the length of the other train.
In 8 sec, s+=+126%2A%288%2F3600%29km
(note that 3600 is the number of seconds in an hour)
s+=+.28km
s+=+280 m