SOLUTION: jack usually mows his lawn in 4 hours, Marilyn can mow the same lawn in 3 hours, how long will it take them to mow the lawn together?

Algebra ->  Rate-of-work-word-problems -> SOLUTION: jack usually mows his lawn in 4 hours, Marilyn can mow the same lawn in 3 hours, how long will it take them to mow the lawn together?      Log On


   

Question 275208: jack usually mows his lawn in 4 hours, Marilyn can mow the same lawn in 3 hours, how long will it take them to mow the lawn together?
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
1/4+1/3=1/x
(4+3)/12=1/x
7/12=1/x
7x=12
x=12/7=1.7143 hours working together..