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Eva sews a costume in 6 hours, Ivana in 8 hours, and Monika in 4 hours. How long will it take them to make the costume if they work together?


t = 1:51 h Wrong answer

Step-by-step explanation:

t1=6 h t2=8 h t3=4 h  s=1/t1+1/t2+1/t3=1/6+1/8+1/4=24130.5417 1/h  t=1/s=1/0.5417=1.84615=1:51 h

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