Working together

Zeru can complete a certain job in 5 days, and Tulu can complete the same job in 3 days. How long will they complete the job if they work together?

Correct answer:

t =  1.875

Step-by-step explanation:

t1=5 d t2=3 d  t (t11+t21)=1  t (1/t1+1/t2)=1  s=1/t1+1/t2=1/5+1/3=1580.5333  t=1/s=1/0.5333=815=187=1.875



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