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Mathematics 8 Online
OpenStudy (anonymous):

Bob and Bill wash dogs to make extra money. Bob can wash all of the dogs in5 hours. Bill can wash all the dogs in 3 hours. How long will it take them to wash the dogs if they work together? A: 1/8 hour B: 8/15 hour C: 1 7/8 hour D: 1/15 hour

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