If Sara can paint a house in 4 hours, and John can paint the same house in 6 hours, how long will it take for both of them working together to paint the same house.

• Sara's 1 hr work = 1/4
  John's 1 hr work = 1/6
  Sara nd John's 1 hr work = 1/4 + 1/6 => 10/24 = 5/12
  
  So both ll finish the work in 12/5 = 2 2/5 hrs => 2hrs 24mins
  
  Ans : 2hrs 24 mins
  
  
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• (4*6)/(4+6)=2.4
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• 5 hours as we can take average of both
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