SOLUTION: A train crossed a platform in 36 s. The length of the train is 160m.what is the length of the platform?

Question 884692: A train crossed a platform in 36 s. The length of the train is 160m.what is the length of the platform?
Answer by Theo(13342) (Show Source): You can put this solution on YOUR website!
the train crosses the platform in 36 seconds.
the length of the train is 160 meters.
start is when the front of the train is at the near end of the platform.
end is when the back of the train is at the far end of the platform.
this depends on how fast the train is moving which is the missing piece to this puzzle.
i'll give you 2 examples so you'll see what i mean.
to begin with.
the train will have passed the platform when the front of the train starts at the near end of the platform and the back of the train ends at the far end of the platform.
to do this, the front of the train will have had to travel 160 meters plus L where L represents the length of the platform.
now we'll do 2 scenarios.
example 1:
the train is traveling at 5 meters per second.
the formula is R * T = D
we know R = 5 meters per second.
we know T = 36 seconds.
D = 5 * 36 = 180 meters.
the front of the train starts at 0 meters and ends at 180 meters.
the back of the train starts at -160 meters and ends at 20 meters.
the length of the platform is 20 meters.
example 2:
the train is traveling at 10 meters per second.
the formula is R * T = D
we know R = 10 meters per second.
we know T = 36 seconds.
D = 10 * 36 = 360 meters.
the front of the train starts at 0 meters and ends at 360 meters.
the back of the train starts at -160 meters and ends at 200 meters.
the length of the platform is 100 meters.
bottom line is you need to know the speed of the train to solve this problem.

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