Question 1023170
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For Joan, it takes 10 hours to paint a house. However, Jessica takes 5 hours to paint a house. 
If working together, how long would they take?
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{{{1/10 + 1/5}}} = {{{1/10 + 2/10}}} = {{{3/10}}}.


It will take {{{10/3}}} hours = {{{3}}}{{{1/3}}} hours.


For details see the lesson <A HREF=http://www.algebra.com/algebra/homework/Rate-of-work-word-problems/Word-problems-WORKING-TOGETHER-by-Fractions.lesson>Using fractions to solve word problems on joint work</A> in this site.