If 5 of the machines, working simultaneously at this rate, produce a total of 200 such parts in 4 days, how many days will it take all 6 machines, working simultaneously at this rate, to produce a total of 300 such parts?

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At a factory. 6 machines work independently at the same constant rate to produce certain parts.

If 5 of the machines, working simultaneously at this rate, produce a total of 200 such parts in 4 days, how many days will it take all 6 machines, working simultaneously at this rate, to produce a total of 300 such parts?
A . 4.0
B . 4.5
C . 5.0
D . 5.5
E . 6.0

Answer: C