The answer is A.

**Quote:**

(1) Working alone and without breaks Joe takes 5 hours to finish the job, which is 400% as long as the time it takes Jeremy to finish the job.

This straightway gives the time that is taken by Joe and Jeremy's time can be easily calculated.

Sufficient.**Quote:**

(2) Working alone and without breaks Joanne takes 10 hours to finish 3 times the job.

Here, we can calculate the time taken by Joanne and Joe. However, without statement 1 we can't arrive at the time taken by jeremy.

Hence not sufficient.