Two trains A and B started from stations P and Q respectively towards each other. Train A started at 7 p.m. at a speed of 60 km/hr and train B started at 4 a.m. (next day) at a speed of 90 km/hr. The distance between the two stations P and Q is 800 km.
If the lengths of the two trains A and B are 400 m and 500 m respectively, then what is the time taken by them to cross each other?
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