SOLUTION: Jennifer can mow the lawn in 40 minutes. Mark can mow the lawn in 20 minutes. Jennifer works for 10 minutes before Mark begins to help. How many minutes do they work together to co

Algebra ->  Rate-of-work-word-problems -> SOLUTION: Jennifer can mow the lawn in 40 minutes. Mark can mow the lawn in 20 minutes. Jennifer works for 10 minutes before Mark begins to help. How many minutes do they work together to co      Log On


   

Question 1151243: Jennifer can mow the lawn in 40 minutes. Mark can mow the lawn in 20 minutes. Jennifer works for 10 minutes before Mark begins to help. How many minutes do they work together to complete the job?
Answer by josgarithmetic(39616) About Me  (Show Source):
You can put this solution on YOUR website!
Jennifer         1/40

Mark             1/20

Jennifer & Mark  1/40+1/20

unknown time both worked together to finish, x


%281%2F40%29%2A10%2B%281%2F40%2B1%2F20%29%2Ax=1
Solve for x.