A can finish a job in 8 hours and B can finish the same job in 12 hours independently. If they work simultaneously, in how many hours can they do the same job?

Correct option is A

Given:
A can finish the job = 8 hours
B can finish the job = 12 hours
Formula Used:
Work rate of A = 1 job / 8 hours
Work rate of B = 1 job / 12 hours
Combined work rate = Work rate of A + Work rate of B
Time taken to complete the job together = 1 / Combined work rate
Solution:
Calculate the work rate of A:
Work rate of A = 1 / 8
Calculate the work rate of B:
Work rate of B = 1 / 12