Problema Solution
max can fix a fence in 9 hours, but his friend jack offers to help and they fix the fence in one hour. How long would it have taken jack to fix the fence alone?
Answer provided by our tutors
Let x represent the number of hours that Jack needs to fix the fence alone
1/9 fence per hour is the rate of Max
1/x fence per hour is the rate of Jack
1 fence per hour is the together rate
1/9 + 1/x = 1
........
........
x = 1.125 hr
x = 1 hr 0.125*60 min
x = 1 hr 7.5 min
Jack would need 1 hours and 7.5 min to fix the fence alone.