Who can paint what? Still confused?

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sally can paint 1/4 of house in hour

john can paint 1/6 of house in hour

together, can paint (1/4) + (1/6) hour

1/4 + 1/6 = 6/24 + 4/24 = 10/24 hour

take them 1 / (10/24) = 24/10 hours finish

24/10 = 2.4 = 2 hours , (.4*60) = 24 minutes

total: 2 hours 24 minutes

if sally can paint house in 4 hours, , john can paint same house in 6 hour, how long take both of them paint house together?


answer 2 hours , 24 mins

how did there??


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