Problema Solution
A cement mason can construct a retaining wall in 16 h. A second mason requires
14 h
to do the same job. After working alone for
8 h,
the first mason quits. How long will it take the second mason to complete the wall?
Answer provided by our tutors
The rate of the first mason is: 1/16 wall per hour
The rate of the second mason is: 1/14 wall per hour
Let 't' represent the time the second mason needs to complete the wall:
8*(1/16) + t*(1/14) = 1
........
click here to see the equation solved for t
........
t = 7 hours
It takes 7 hours for the second mason to complete the wall.