Working together, Katherine and Marina can sand a large cabinet in 2 hours. It would take Katherine 10 hours to do the job alone. A table showing Rate in part per hour, Time in hours, and Part of Cabinet Sanded. The first row shows, Katherine and has, StartFraction 1 Over 10 EndFraction, 2, and StartFraction 2 Over 10 EndFraction. The second row shows, Marina and has, r, 2, and 2 r. What is the value of r, the part of the job that Marina can complete in 1 hour? 0.1 0.4 0.5 0.6