Work Problem with Two People
Algebra
Janne and JD can finish a tailor job in 3 hours when they work together. One day, Janne had to work alone for 3 hours before JD came to help. If the they were able to finish the work after another hour, how long (in hours) will it take Janne to finish the job alone?
A$3.5$
B$4$
C$4.5$
D$5$