<PRE><B>Question 1024703</B>
The rates combined for the two typists are additive.


{{{1/5+1/7=7/35+5/35=12/35}}}


This rate means TWELVE JOBS in THIRTY FIVE HOURS.  You are looking for  {{{(35/12)(HOURS/JOB)}}},  the time in hours for 1 job.


2 hours 55 minutes</PRE>