Question 530487
Tyrone can paint a kitchen in 7 hours, and Shauna can paint the same kitchen in 6 hours. How long would it take for both working together to paint the kitchen?
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Ty rate: 1/7 job/hr
Sh rate: 1/6 job/hr
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Together rate: 1/x job/hr
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Equation: 
rate + rate = together rate
1/7 + 1/6 = 1/x
Multiply thru by 42x to get:
6x + 7x = 42
13x = 42
x = 42/13 = 3 3/13 hr = 3 hr 14 minutes
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Cheers,
Stan H.