Sunday, August 18, 2013

if one man paints a house in 3 hours and another man paints the same house in 5 hours, how fast can they paint the house together.

1%2F3%2B1%2F5=1%2Ft 
5%2F15%2B3%2F15=1%2Ft 
8%2F15=1%2Ft 

t=15%2F8=1%267%2F8
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