Working independently, Tina can do a certain job in 12 hours. Working independently, Ann can do the same job in 9 hours. If Tina works independently at the job for 8 hours and then Ann works independently, how many hours will it take Ann to complete?

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Vibes Grt answered
Tina can do a job in 12 hrs
thus in 1 hr tina will do 1/12th job

in 8 hrs tina can do 1/12 * 8= 3/4
thus 1/4th job is remaining
ann can do a  job in 9 hrs
thus
she can do 1/4th job in 9*1/4 = 2.25 hrs=2 hrs 15 min

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