SOLUTION: How long will it take Jafar and Kadir working together to cultivate a filed which Jafar can cultivate alone in three hours and Kadiraline in six hours?

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Question 893109: How long will it take Jafar and Kadir working together to cultivate a filed which Jafar can cultivate alone in three hours and Kadiraline in six hours?
Found 2 solutions by Jynald-, Alan3354:
Answer by Jynald-(6) About Me  (Show Source):
You can put this solution on YOUR website!

1/6 + 1/3 = 1/x
1/6+2/6 = 1/x
3/6 = 1/x
1/2 = 1/x
x = 2 hours

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
J does 1/3 per hour
K does 1/6 per hour
etc
============
There's a shortcut:
3*6/(3+6) = 2 hours