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OpenStudy (anonymous):
Chao, who is an experienced architect, can draw a certain set of plans in 6h. It takes Carl, who is a new architect, 10h to draw the same set of plans. How long would it take them working together to draw the set of plans?
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OpenStudy (mertsj):
Chao gets 1/6 of the job done in 1 hour Carl gets 1/10 of the job done in 1 hour
OpenStudy (mertsj):
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