SOLUTION: A passenger train travels at a speed of 72km/h. A man on the passenger train observes a goods train travelling at a speed of 54km/h in the opposite direction . If the goods train p
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Question 1061528: A passenger train travels at a speed of 72km/h. A man on the passenger train observes a goods train travelling at a speed of 54km/h in the opposite direction . If the goods train passes him in 8 seconds, find the length of the goods train.
Please help me with this question ' cause i am in rush. Thank you. Answer by ikleyn(52787) (Show Source):
You can put this solution on YOUR website! .
A passenger train travels at a speed of 72km/h. A man on the passenger train observes a goods train travelling at a speed
of 54km/h in the opposite direction . If the goods train passes him in 8 seconds, find the length of the goods train.
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The speed of the passenger train is 72 km/h = 20 m/s.
The speed of the goods train is 54 km/h = 15 m/s.
The passenger is moving with the speed 20 m/s + 15 m/s = 35 m/s relative to the goods train (since the trains moves in opposite directions).
Hence, the passenger sees the goods train before his own eyes during seconds, where L is the length of the goods train.
So, your equation is
= 8,
which gives the length of the goods train L = 8*35 = 280 m.
Answer. The length of the goods train is 280 m.
