Task: Question Answering
Input (English): Problem: working together , jose and jane can complete an assigned task in 15 days . however , if jose worked alone and complete half the work and 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 that jane is more efficient than jose 
Options: a ) 26 days , b ) 31 days , c ) 50 days , d ) 65 days , e ) 36 days
Output (English): c