Person A can complete a job in 6 hours. Person B can complete the same job in 4 hours. Working at the same rate, how many hours will it take both of them to complete the job?
+36916 1/6 + 1/4 = 1 / T Solve for T the time for two working together.
or
(T1 x T2) / (T1 + T2) = Tcombined
