For a certain job Ahmed charges $ 12 an hour while Sana charges $6 an hour. If both worked the same amount of time together on a job how many hours did each of them work if their combined charges were $144?

1. A Option A: 6
2. B Option B: 7
3. C Option C: 8
4. D Option D: 8.3
5. E Option E: 10

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