SOLUTION: if sally can paint a house in 4 hrs, and john can paint the asame house in 6 hrs, how long will it take for both of them to apint the house together?

Algebra ->  Algebra  -> Percentage-and-ratio-word-problems -> SOLUTION: if sally can paint a house in 4 hrs, and john can paint the asame house in 6 hrs, how long will it take for both of them to apint the house together?      Log On

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Question 61065: if sally can paint a house in 4 hrs, and john can paint the asame house in 6 hrs, how long will it take for both of them to apint the house together?
Found 2 solutions by checkley71, funmath:
Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
TO SOLVE THESE TYPE OF PROBLEMS WE MULTIPLY THE TIMES & THEN DIVIDE BY THE SUM OF THE TIMES THUS
4*6/(4+6)=24/10=2.4 HOURS TO PAINT THE HOUSE TOGETHER

Answer by funmath(2925) About Me  (Show Source):
You can put this solution on YOUR website!
if sally can paint a house in 4 hrs, and john can paint the asame house in 6 hrs, how long will it take for both of them to apint the house together?
Let sally's rate be x/4
Let john's be x/6
:
x%2F4%2Bx%2F6=1
3x%2F12%2B2x%2F12=1
5x%2F12=1
12%285x%2F12%29=12%2A1
5x=12
5x%2F5=12%2F5
x=2.4 hrs
or x=2hr+.4(60)min=2hrs and 24 min
Happy Calculating!!!