algebra
posted by karon .
jack usually mows his lawn in 4 hours mariltn can mow the same yard in 7 hours how much time would it take for them to mow the lawn together

algebra 
bobpursley
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.
Respond to this Question
Similar Questions

Algebra
Jack usually mows his lawn in 4 hours. Marilyn can mow the same yard in 7 hours. How much time could it take for them to mow the lawn together? 
algebra
Jack usually mows his lawn in 6 hours. Marilyn can mow the same lawn in 5 hours How much time would it take them to mow the lawn together? 
algebra
Jack usually mows his law in 5 hours. Marilyn can mow the same law in 6 hours. How much time would it take for them to mow the lawn together? 
Math
Jack usually mows his lawn in three hours. Marilyn can mow the same yard in 5 hours. How much time would it take for them to mow the lawn together? 
Algebra II
Jack usually mows his lawn in 6 hours. Marilyn can mow the same lawn in 7 hours. How long would it take if they were both working together? 
algebra
Jack usually mows his lawn in 4 hours. Marilyn can mow the same yard in 5 hours. How much time would it take for them to mow the lawn together? 
math
Jack usually mows his lawn in 4 hours. Marilyn can mow the same in 5 hours. How much time would it take for them to mow the lawn together? 
math/117
Jack usually mowes his lawn in 7 hours. Marilyn can mow the same yard in 4 hours. How musch time would it take for them to mow the lawn together? 
algebra
Jack usually mows his lawn in 4hrs Marilyn can mow the same yard in 3hrs. how much time it would take for them to mow the lawn together. 
MATH
Jack usually mows his lawn in 3 hours. Marilyn can mow the same yard in 5 hours. How long would it take them to mow the lawn together?