Together 65074

Jana washes 20 windows alone in 4 hours. Petra would be able to do it in 6 hours. How long will it take to work together?

Correct answer:

t =  2.4 h

Step-by-step explanation:

t1=4 h t2=6 h  t (1/t1+1/t2)=1 t (1/4+1/6)=1  5t=12  t=512=2.4  t=512=2.4=2.4 h

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