OK, we can solve this with a proportion.......using 1 hr. = 60 minutes, we have
(2/9)/9 = d/60 where d is the distance Fiona can swim in an hour...so we have...
2/81 = d/60 cross-multiply
81d = 2*60 divide by 81 on both sides
d = (2*60)/81 = 40/29km = about 1.481km
