<PRE><B>Question 77312</B>
An experienced accountant can prepare a tax return in 13 hours.  A novice accountant can do the job in 20 hours.  How long will it take them to do the job working together?
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Exp account DATA:
time = 13 hr/job ; rate= 1/13 job/hr
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Novice account DATA:
time = 20 hr/job ; rate= 1/20 job/hr
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Together DATA:
time = x hr/job ; rate = 1/x job/hr
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EQUATION:
rate + rate = rate together
1/13 + 1/20 = 1/x
33/260 = 1/x
260/33 = x
 x= 7.88 hrs (time required working together)
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Cheers,
Stan H.</PRE>