SOLUTION: the daughter can mow the lawn in 30 minutes her father can mow the lawn in 40 minutes the daughter works for 10 minutes before the father begins to help how long do they work toget

Algebra ->  Rate-of-work-word-problems -> SOLUTION: the daughter can mow the lawn in 30 minutes her father can mow the lawn in 40 minutes the daughter works for 10 minutes before the father begins to help how long do they work toget      Log On


   

Question 1067178: the daughter can mow the lawn in 30 minutes her father can mow the lawn in 40 minutes the daughter works for 10 minutes before the father begins to help how long do they work together to complete the job
Answer by josgarithmetic(39623) About Me  (Show Source):
You can put this solution on YOUR website!
Daughter: 1%2F30
Father: 1%2F40

Father helps for some t minutes:
%281%2F30%29%2A10%2B%281%2F30%2B1%2F40%29%2At=1
Solve for t.