Question

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 the remainder of the jobs?

Answer 1

In 1 hour tina does 1/12 of jobSo in 8 hrs she will do =8/12 work=2/3work.Rest work 1-2/3=1/3.Now ann works in 1 hr=1/9 work.so 1/3 work she will complete in 3 hrs