A person started his journey in the morning. At 11 am he covered $\frac{3}{8}$ of the journey and on the same day at 4.30 pm he covered $\frac{5}{6}$ of the journey. He started his journey at :
[A] 3.30 am
[B] 6.00 am
[C] 6.30 am
[D] 7.00 am