Together it takes three different machines $5$ hours to complete a job. The first machine takes $10$ hours to

Together it takes three different machines $5$ hours to complete a job. The first machine takes $10$ hours to complete the job alone and the second machine takes $15$ hours to complete the job alone. How many hours would it take the third machine alone to complete the job?

A. $20$
B. $25$
C. $30$
D. $35$
E. $40$

The OA is C

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