Machine A working alone can complete a job in 10 hours. Machine A+B working alone can do the same job in 16 hours. How long will it take machine B working at their respective constant rates to complete the job?  Choices:
A) 20/3
B) 80/3
C) 50/4
D) 90/11
E) 23/7
Machines ( A ) ( 80/3 ) (A+80/3)   ---Time - 10 - ( - ) -(16)   ---Rate 16--- 6 -- 10   --Work 160 --160 -160   A+80/3 = (160/6) = 80/3   80/3
<result>B</result>
Machine A working alone can complete a job in 10 hours. Machine A+B working alone can do the same job in 16 hours. How long will it take machine B working at their respective constant rates to complete the job?