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If Jim Roller can paint a room in 3 hours while John Brush would take 4 hours, how long will they take if they work together? 1/7 hour 1 hour 1 5/7 hours

If Jim Roller can paint a room in 3 hours while John Brush would take 4 hours, how long will they take if they work together? 1/7 hour 1 hour 1 5/7 hours
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If Jim Roller can paint a room in 3 hours while John Brush would take 4 hours, how long will they take if they work together? 1/7 hour 1 hour 1 5/7 hours

User Gelonida
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The answer is 1 5/7 hours. 
User Funguy
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