Question 253585
How do I solve this? Sally can paint a house in 4 hours. It takes John 6 hours to paint the same house. How long does it take them together? 
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Sally's rate: 1/4 job/hr
John's rate: 1/6 job/hr
Together rate: 1/x job/hr
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Equation:
rate + rate = together rate
1/4 + 1/6 = 1/x
Multiply thru by 12x
3x + 2x = 12
5x = 12
x = 12/5 = 2.4 hrs (time to do the job if Sally and John work together.
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Cheers,
Stan H.