Question 250609
In one hour Jack mows 1/5 of the lawn
In one hour Mary mows 1/3 of the lawn
so we would think that together they can mow in less than 3 hours
x/5+x/3=1
15/8 hrs.=1.875 hrs. =1:52.5 hrs. almost two hours



15/(8*5)+15/(8*3)=1
Jack mows 3/8 and Mary mows 5/8
3/8+5/8=1