Problema Solution
Sue has a riding lawn mower and can cut the grass at her home in 40 minutes. She then buys a push mower for her son to help cut the grass. If they now can do the lawn in 25 minutes, how long would it take to cut the grass using only the push mower?
Answer provided by our tutors
let 'x' represent the time in minutes taken to mow the lawn with only the push mower
1/25 = 1/x + 1/40
solving for 'x' we have x=66 2/3
66 2/3 minutes = 1 hour 6 2/3 minutes
it would take approximately 1 hour and 7 minutes to cut the grass with only the push mower