At 9:00
A、m．trAin t 1EFt thE trAin stAtion AnD two hours lAtEr trAin s lEFt thE sAmE stAtion on A pArAllEl trACk． iF trAin tAvEr AgED 60 kilomEtErs pEr hour AnD trAin sAvEr AgED 75 kilomEtErs pEr hour until s pAssED t．At whAt timE DiD s pAss t
A、2:00 p．m． B、5:00 p．m．
C、6:00 p．m．
D、7:00p．m．
E、9:00 p．m．