Question

A cross-country skier covered 1/3 of her race in one hour, 2/5 of the race the next hour, and the remainder of her race in the third hour. What fraction of her race did the skier cover during the third hour of the race?

Answer 1

In the third hour she covered 4/6 of the race. 
1/3=5/15
2/5=6/15
5+6=11
11=4=15/15

Answer 2

2/15. Maybe it is if the problem is a multiplication.