Posted by **Liam** on Wednesday, August 29, 2012 at 5:28pm.

A train travels at 3m/s and parallel and very near to the train is a wall the has a slope of 12degrees, the window you see this wall through is .9m high, 2m across, and when you look out you first see the top edge at the lower left of the window, moving towards the top right of the window, how long at 3m/s will it take for the edge of the wall to no longer be visible?

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