Posted by karon on Tuesday, December 13, 2011 at 9:05pm.
In 28 hours, Jack can do 7 lawns, and mariltn can do 4, so combined, in 28 hrs, they can do 11 lawns.
rate combined: 11/28 lawns per hour
time= 1lawn/rate= 28/11 hours.
Related Questions
Algebra - Jack usually mows his lawn in 4 hours. Marilyn can mow the same yard ...
alegbra - Jack usually mows his lawn in 4 hours. Marilyn can mow the same yard ...
Math - Jack usually mows his lawn in three hours. Marilyn can mow the same yard ...
algebra - Jack usually mows his lawn in 6 hours. Marilyn can mow the same lawn ...
math - Jack usually mows his lawn in 4 hours. Marilyn can mow the same in 5 ...
algebra - Jack usually mows his law in 5 hours. Marilyn can mow the same law in ...
algebra - 1. Find the variation constant and and an equation of variation where ...
algebra - Jack usually mows his lawn in 4hrs Marilyn can mow the same yard in ...
Algebra II - Jack usually mows his lawn in 6 hours. Marilyn can mow the same ...
math/117 - Jack usually mowes his lawn in 7 hours. Marilyn can mow the same yard...
For Further Reading
