Subject: mathqa
Question: 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 t hours will it take if jim types the report and mary edits it immediately after he is done ?
Option: 
A: 13.4
B: 10.8
C: 12.4
D: 41.4
Answer: D