4. It takes a lady 3 days to wash the windows inside and out. Her husband can do the job in 4 days. How fast can they do it together?

asked Apr 16, 2021 146k views

4 votes

4.

It takes a lady 3 days to wash the windows
inside and out. Her husband can do the job
in 4 days. How fast can they do it together?

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4 votes

1/tb = 1/t1 + 1/t2
1/tb = 1/3 + 1/4
1/tb = 4/12 + 3/12
7/12 flip reciprocal = 12/7
It takes them 1.71 days

Arman Peiravi answered Apr 21, 2021

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