Two trains travel on parallel tracks that are 5 km long. One starts at the southern end, travelling north at a constant speed of 25 m s-. The second train starts at the northern end 40 s later, travelling south at a constant speed of 15 ms-!. a Sketch the two displacement-time graphs on the same set of axes. b Find the time for which the first train has been moving and the distance the first train has travelled when the trains pass each other.

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