Three workers have to do a certain job. the first worker can finish the job in 8 hours. the second worker can finish the job in 4 hours. the third worker can also finish the job in 4 hours. how long will it take the three workers to finish the job if they work together?
pls

Working together three workers would take 1 hour 36 minutes to finish the job

Solution:

Given that first worker can finish the job in 8 hours

So in one hour, first worker can do th of the work

The second worker can finish the job in 4 hours

So in one hour, second worker can do th of the work

The third worker can also finish the job in 4 hours

So in one hour, third worker can do th of the work

The three workers working together in 1 hour can do:

The three worker can thus do th of the work in one hour

Hence the three of them together can finish the work in hours

hours

Thus working together three workers would take 1 hour 36 minutes to finish the job