If 50 apprentices can finish a job in 4 hours, and 30 journeymen can finish the same job in 8 hours, how much of the job should be completed by 10 apprentices and 15 journeymen in one hour?  Choose the correct choice from the following choices.
A) 1/9	B) 29/180	C) 9/80	D) 1/5	E) 39/121
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  8*2= 
<gadget id="calculator"> 8*2</gadget>
<output>16</output>
16 hours;   In 1 hour 15 journeymen can finish 1/16 of the job.   Therefore, in 1 hour 10 apprentices and 15 journeymen can finish 1/20+1/16=9/80 of the job.   Answer: 9/80
<result>C</result>
If 50 apprentices can finish a job in 4 hours, and 30 journeymen can finish the same job in 8 hours, how much of the job should be completed by 10 apprentices and 15 journeymen in one hour?