SOLUTION: A train having a length pf 400m, travelling at speed of 15m/s crosses the platform in one min. What is the length of the platform?

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Question 1147376: A train having a length pf 400m, travelling at speed of 15m/s crosses the platform in one min. What is the length of the platform?
Answer by ikleyn(52786) About Me  (Show Source):
You can put this solution on YOUR website!
.

In one minute, the front of the train moves forward  from the one end of the platform by  15 m/s * 60 seconds = 900 meters.


Since the problem says that the train passes (passes -- not crosses (!) ) the platform in 1 minute, it means that 

the rear of the train comes alongside with the other end of the platform.


Therefore, the length of the platform is  900 - 400 = 500 meters.

Solved, answered and explained.

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To see other similar solved problem, look into the lessons
    - A train passing a telegraph post and passing a bridge
    - A train passing a platform
    - A train passing through a tunnel
    - A light-rail train passing a walking person
    - A train passing another train
in this site.


Come again to the forum soon to learn something new (!)