0
John does (1/10) = 0.1 of the job each day. Jack does (1/5) = 0.2 of the job each day.
Working together, they do (0.1 + 0.2) = 0.3 of the job each day.
(1 job) / (0.3 job per day) = (3 and 1/3) days
Not So Amazing - 2012 Day Job 1-1 was released on:
USA: 7 January 2012
Deader Days - 2012 Day Job 1-1 was released on:
USA: 26 March 2012
Day Job - 2013 was released on:
USA: 1 March 2013
LaLa Land - 2011 First Day on the Job 1-1 was released on:
USA: 15 June 2011