Working together, Jose and Jane can complete an assigned task in 20 days. However, if Jose worked alone and complete half the work then Jane takes over the task and completes the second half of the task, the task will be completed in 45 days. How long will Jose take to complete the task if he worked alone? Assume Jane is more efficient than Jose.
A. 25 days.
B.30 days.
C. 60 days.
D. 65 days
E. 36 days.

OA: C