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Robert can paint a room in 12 hours. Dennis and Vince can paint the room in 10 hours and 9 hours, respectively. If Dennis and Vince work together for 2 hours, how long will it take Robert to finish the job?​.​

Sagot :

For about 4 hours. Because Dennis and Vince work together for 2 hours. And Robert is only one so it takes double time.