Question 184890
If Sally can paint a house in 4 hours and John can paint the same house in six hours, how long will it take for the both of them to paint the house together? 
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Sally DATA;
time = 4 hr/job ; rate = 1/4 job/hr
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John DATA:
time = 6 hr/job ; rate = 1/6 job/hr
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Together DATA:
time = x hr/job ; rate = 1/x job/hr
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Equation:
rate + rate + together rate
1/4 + 1/6 = 1/x

Multiply thru by 12x to get:

3x + 2x = 12
5x = 12
x = 2.4 hrs (time to do the job together)
Note: 0.4 hours = 0.4*60 minutes = 24 minutes
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2.4 hrs = 2 hrs 24 minutes
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Cheers,
Stan H.