Question

Dan can tile a floor in 3 hours. his assistant could tile the same floor in 8 hours. if they work together, how long will it take to tile the floor?

Answer 1

There is a formula for this:

Total Time = (worker1 * worker2) / (worker1 + worker2)

(3 * 8) / (3 + 8)

24 / 11 =

2.1818181818 hours