He length of a train is `a` metre and speed `x` metre/sec.the length of another train is `b` metre and its speed is `y` metre/sec.the trains are coming from opposite sides.the time taken by them to cross each other is (in sec) options are (a)a+b/x+y,(b)x+y/a+b,(c)x-y/a-b and (d)a-b/x-y
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