Jake can mow a lawn in 3 hours. Kellie can mow a lawn in 4 hours. If they work together, how long will it take them to mow one lawn?

Question

Jake can mow a lawn in 3 hours. Kellie can mow a lawn in 4 hours. If they

work together, how long will it take them to mow one lawn?

help

Answer 1

Jake can move 1/3 of the lawn in 1 hour

Kellie can mow 1/4 of the lawn in 1 hour

together they can move 1/3 + 1/4 = 7/12 of the lawn in a hour

Together they can move the lawn in 12/7 hours = 1 and/ 5/7 hours or approximately 1 hour and 43 minutes