Three painters

The three painters have painted bridge. The first would work done in 5 days, the second in 6 days, and the third in 7.5 days. How long will the bridge work if they work together?

Result

x =  2 d

Solution:

Solution in text x =







Leave us a comment of example and its solution (i.e. if it is still somewhat unclear...):

Showing 2 comments:
#1
Nestor
Why the third fraction 1/7.5 when it is supposed to be 1/7?

#2
Dr Math
Yes, there was bug, but now is corrected. Thank you

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