<PRE><B>Question 926098</B>
x = ali work rate (jobs/hr)
y = susan work rate (jobs/hr)
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rate = work/time
time = work/rate
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rate working together:
x + y = 1/9 + 1/5
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time working together:
time = 1/(x + y) = 1/( 1/9 + 1/5 )
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answer:
time = 3.21428571429 hours
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