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Two workers A and B are engaged to do a work. A working alone takes 8 hours more to complete the job than if both worked together . If B worked along, he would need 4.5 hours more to complete the job than they both working together. What time would they take to do the work together?

1. A 4 hours
2. B 5 hours
3. C 6 hours
4. D 7 hours