Reading records

Lucy, Tereza, and Patricia decided to compile the compulsory reading records together. It would take 30 days for Lucy alone, 36 for Tereza, and 45 for Patricia. How long will it take to make records if they will work together?

Final Answer:

t =  12 d

Step-by-step explanation:

h=301+361+451=1806+1805+1804=1806+5+4=18015=1210.0833  t   h = 1  t=1/h=1/0.0833=12 d



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