An experienced bricklayer can construct a small wall in 3 hours. An apprentice can complete the job in 6 hours. Find how long it takes if they work together

Answer 1

#1 Bricklayer can do the wall as 1/3 task per hour

#2 Bricklayer can do the wall as 1/6 task per hour

Together, they work as 1/3 + 1/6 = 3/6 task per hour = 1/2 task per hour

So, they will finish the task in 2 hours!