A train travels with the speed of \[45\frac{1}{3}\] km/hour for the first \[3\frac{1}{2}\] hours. Thereafter, the train changes its speed and travels with the speed of \[55\frac{1}{2}\] km/hour for the next \[3\frac{1}{2}\] hours. What distance does the train travel during the six hours?

• A.  \[\frac{3691}{12}\] km
• B.  \[\frac{3291}{12}\] km
• C. \[\frac{3622}{12}\] km
• D.  \[\frac{3691}{12}\] km
• E.  None of these