If two workers can do a task in 8 hours and a third worker can do the same task in 12 hours, then how long would it take the three workers together to complete the task?
9 adn 1/3 hours
Since the question does not specify the individual work rate of the 2 men, we therefore, have to lump them together as one with a rate of 8 hours.
1 / 8 + 1 / 12 =1 / J
J = 4.8 hours that would take the 3 men to finish the task.