Answer:
Productivity of clerical worker (fraction of job done in 1 hr) = x
Productivity of secretary (fraction of job done in 1 hr) = y
y = 4x
x*6hrs + y*6hrs = 1 (100% of work done)
6x + (4x)*6 = 1
30x = 1
x = 1/30
He can do 1/30th of the job in 1 hr. So it will take him 30 hrs to do 100% of the job.
Explanation:
You may want to visit my you tube channel "Sciency Sergei" to see if anything is of interest to you. You may also suggest topic to discuss or problem to solve.