<PRE><B>Question 992627</B>
Craig and Pam, working together, can mow the lawn in 9 hours. Working alone, Pam takes three times as long as Craig. How long does it take Craig to mow the lawn alone? 
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Together rate:: 1/9 job/hr
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Craig rate:: 1/x job hr
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Pam rate:: 1/(3x) job/hr
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Equation:
rate + rate = together rate
1/x + 1/(3x) = 1/9
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Multiply thru by 9x to get:
9 + 3 = x
x = 12 hrs (time for Craig alone)
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Cheers,
Stan H.</PRE>