Math Rate Question (Underneath in description)

Question

It would take Tom 8 hours to whitewash the fence in the backyard. His friend Hank would need 12 hours to do the same job by himself. They both start work at 9 in the morning, each at opposite ends of the fence, under the watchful eye of Tom's Aunt Polly. At what time in the afternoon is the task complete?

Answer 1

t is the time both are working

(t / 8) + (t / 12) = 1

Can you solve for t?

Then add to to 9:00 am. and answer?