Required 3504

The milling machine makes the part in 20 minutes. On a better machine, it can make 30 parts in 6 hours. By how much percent will the time required to produce one part on a new machine be reduced?

Correct answer:

p =  40 %

Step-by-step explanation:

$$\begin{gathered} t_1=20 \\ {t}_2=6\cdot 60/30=12 \\ p=100\cdot (t_1-t_2)/t_1=100\cdot (20-12)/20=40\% \end{gathered}$$

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