Two typists of varying skills can do a job in 6 minutes if they work together. If the first typist typed alone for 4 minutes and then the second typist typed alone for 6 minutos, they would be left with 1/5 of the whole work. How many minutes would it take the slower typist to complete the typing job working alone?

Options

A. 10 minutes
B. 15 minutes
C. 12 minutes
D. 20 minutes

Answer

B