What was his average speed?
I) He travelled the last $$\frac{1}{4}$$ of the distance at 6 Kmph.
II) He travelled the first $$\frac{1}{4}$$ of the distance at 5 Kmph.

A

if the statement I alone is sufficient to answer the question.

B

if the statement II alone is sufficient to answer the question.

C

if the statements I and II together are sufficient to answer the question but neither statement alone is sufficient.

D

if both the statements I and II together are not sufficient to answer the question and additional data is required.