A train crosses a platform of 150 m in 15 sec, same train crosses another platform of length 250 m in 20 sec. then what is the length of the train?

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1. Length of train = 150 m

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2. Let’s take the length of the train to be X and the speed of the train to be V m/s.
   (150+X) = V*15
   Similarly
   (250+X) = V*20

   Dividing both equations and cancelling V, we get
   (150+X)/(250+X) = 3/4
   600+4X = 750+3X
   X=150

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3. length of train = 150 m

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