If 50 apprentices can finish a job in 4 hours, and 30 journeymen can finish the same job in 5,5 hours, how much of the job should be completed by 10 apprentices and 15 journeymen in one hour?
Choose the correct option:
A) 1/9 B) 29/180 C) 26/143 D) 1/5 E) 31/220
50 apprentices can finish the job in 4 hours,thus:   10 apprentices can finish the job in   4*5= 
<gadget id="calculator">  4*5</gadget>
<output>20</output>
20 hours;   In 1 hour 10 apprentices can finish 1/20 of the job.   30 journeymen can finish the same job in 4,5 hours,thus:   15 journeymen can finish the job in  5.5*2= 
<gadget id="calculator"> 5.5*2</gadget>
<output>11</output>
11 hours;   In 1 hour 15 journeymen can finish 1/11 of the job.   Therefore, in 1 hour 10 apprentices and 15 journeymen can finish 1/20+1/11=31/220 of the job.   Answer: 31/220
<result>E</result>
If 50 apprentices can finish a job in 4 hours, and 30 journeymen can finish the same job in 5,5 hours, how much of the job should be completed by 10 apprentices and 15 journeymen in one hour?