Two consultants can type up a report in 12.5 hours and edit it in 7.5 hours. If Mary needs 30 hours to type the report and Jim needs 12 hours to edit it alone, how many R hours will it take if Jim types the report and Mary edits it immediately after he is done?  Choose the correct choice from the following choices:	A) 41.4	B) 34.1	C) 13.4	D) 12.4	E) 10.8
Break down the problem into two pieces: typing and editing.   Mary needs 30 hours to type the report--&gt; Mary's typing rate = 1/30 (rate reciprocal of time)(point 1 in theory below);   Mary and Jim can type up a report in 12.5and --&gt; 1/30+1/x=1/12.5=2/25 (where x is the time needed for Jim to type the report alone)(point 23 in theory below)--&gt; x=150/7;   Jim needs 12 hours to edit the report--&gt; Jim's editing rate = 1/12;   Mary and Jim can edit a report in 7.5and --&gt; 1/y+1/12=1/7.5=2/15 (where y is the time needed for Mary to edit the report alone) --&gt; y=20;   How many R hours will it take if Jim types the report and Mary edits it immediately after he is done--&gt; x+y=150/7+20=~41.4   41.4nswer: 41.4.
<result>A</result>
Two consultants can type up a report in 12.5 hours and edit it in 7.5 hours. If Mary needs 30 hours to type the report and Jim needs 12 hours to edit it alone, how many R hours will it take if Jim types the report and Mary edits it immediately after he is done?