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niall can do a job in 4 days. When Niall and Celine wor together it would take them 2 1/3 days. How long would the job take Celine to do the job alone?

Sagot :

three and one-half lowest term is one and one-half

Nial can complete 1/4 part of the job in 1 day
Nial & Celine can complete  1/(7/3) = 3/7 part of a job in 1 day
thus Celine can complete    3/7 - 1/4 = (12-7)/28  = 5/28 part of a job in 1 day
# of days Celine will take to do the whole job =    28/5 = 5 3/5 days