Machines

In the workshop are three machines. The first is treated 250 parts for 4.7 hours, the second is treated 300 parts for 1.9 hours, and the third is treated 230 parts for 4.6 hours. How long will it take to make 3100 parts if all three machines are worked simultaneously?

Correct answer:

t =  11.87 h

Step-by-step explanation:

v1=250/4.7=53.1915 1/h v2=300/1.9=157.8947 1/h v3=230/4.6=50 1/h  v1t+v2t+v3t=3100  t(v1+v2+v3)=3100 t=3100/261.0862 t=11.87 h



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