Angela, Bernie, and Colleen can complete a job, all working together, in 2 hours. Angela and Bernie, working together at their respective rates, can complete the same job in 5 hours. How long would it take Colleen, working alone, to complete the entire job? Select:
A) 8 hours
B) 10/3 hours
C) 12 hours
D) 16 hours
E) 20 hours
A+B+C complete the job in 2 hours.   A+B complete the job in 5 hours.   A+B and C complete the job in 2 hours --&gt;1/(A+B) + 1/C = 1/2--&gt;1/5+1/C=1/2 ----&gt; C=10/3 hours. ANS 10/3 hours
<result>B</result>
Angela, Bernie, and Colleen can complete a job, all working together, in 2 hours. Angela and Bernie, working together at their respective rates, can complete the same job in 5 hours. How long would it take Colleen, working alone, to complete the entire job?