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Q 1414512450.     A train `A` is `180` m long, while another train `B` is `240` m long. A has a speed of `30` km/h and `B'`s speed is `40` km/h. If the trains move in opposite directions, find when will `A` pass `B` completely?
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)