Two companies

The family ordered two companies to modify the garden. The first would be done in 20 days; the second would take 40% less time. How long will they work together if the second company started working when the first worked for four days?

Correct answer:

t =  6 d

Step-by-step explanation:

4/20+t (1/20+1/(2040/100 20))=1  13.333333t=80  t=13.3333333380=6  t=6=6 d

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