Question 621039
If you weed the garden in 90 minutes it means that you weed {{{6/9}}} of a garden per hour. If you friend takes 20 more minutes that means that he takes 110 minutes or that he weeds {{{6/11}}} of a garden per hour. If you find a common denominator between {{{6/9}}} and {{{6/11}}} you get {{{66/99}}} and {{{54/99}}}. If you add 66 and 54 together you get {{{66+54=110}}}. Thus you complete {{{110/99}}} of the weeding in 1 garden over the course of 1 hour. {{{110/99}}} can be simplified to {{{10/9}}} which amounts to the non-terminating decimal of 1.111. If you were to divide 1 hour (60 minutes) by 1.111 you would get {{{60/1.111=54}}} (in minutes). This means that it would take approximately 54 minutes for you and your friend to finish weeding 1 garden.