Cleaners

Milan would clean up the room for 2.5 hours, Eric would take 10 hours. How long they swept the room together?

Correct result:

t =  120 min

Solution:

t1=1/(1/2.5+1/10)=2 t=60 t1=60 2=120 mint_{1}=1/(1/2.5+1/10)=2 \ \\ t=60 \cdot \ t_{1}=60 \cdot \ 2=120 \ \text{min}



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