Angela, Bernie, and Colleen can complete a job, all working together, in 4 hours. Angela and Bernie, working together at their respective rates, can complete the same job in 6 hours. How long would it take Colleen, working alone, to complete the entire job?
Choose one:
A) 8 hours B) 10 hours C) 12 hours D) 16 hours E) 24 hours
A+B+C complete the job in 4 hours.   A+B complete the job in 6 hours.   A+B and C complete the job in 4 hours --&gt;1/(A+B) + 1/C = 1/4--&gt;1/6+1/C=1/4 ----&gt; C=24 hours. ANS 24 hours
<result>E</result>
Angela, Bernie, and Colleen can complete a job, all working together, in 4 hours. Angela and Bernie, working together at their respective rates, can complete the same job in 6 hours. How long would it take Colleen, working alone, to complete the entire job?