John can finish a job in 30 days. If he worked for 15 days alone before he was joined by Kennedy to complete the job in 3 days, how many days will it take both of them to complete the entire job?  Choose the correct choice from the following options.
A) 4 B) 3 C) 5 D) 6.5 E) 6
6xplanation:   John and Kennedy complete half work in 3 days   =&gt; they can complete whole work in 6 days   Answer: Option 6
<result>E</result>
John can finish a job in 30 days. If he worked for 15 days alone before he was joined by Kennedy to complete the job in 3 days, how many days will it take both of them to complete the entire job?