tow trains are moving i opposite directions @60km/hr n 90Km/hr .their lengths r 1.10km n 0.9 km respectively.the time taken by the slower train to cross the faster trai in seconds? this d q of relative velocity . i knw d as but i want to clarify one thing y r we adding the length of two trains? for solving this pblm.

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tow trains are moving i opposite directions @60km/hr n 90Km/hr .their lengths r 1.10km n 0.9 km respectively.the time taken by the slower train to cross the faster trai in seconds? this d q of relative velocity . i knw d as but i want to clarify one thing y r we adding the length of two trains? for solving this pblm.

Physics
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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suppose that you are standing in the engine of the first train , then the instant of crossing the trains start when the second train's engine just passes by you and it will last till the last boggie of the train passes the last boggie of first train. so in talking realtively , we add the length of two trains

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