Working alone, Mary can pave a driveway in 8 hours and Hillary can pave the same driveway in 6 hours. When they work together, Mary thrives on teamwork so her rate increases by 33.33%, but Hillary becomes distracted and her rate decreases by 50%. If they both work together, how many hours will it take to pave the driveway?

A. 3 hours
B. 4 hours
C. 5 hours
D. 6 hours
E. 7 hours


OA B

Source: Veritas Prep