Okay, lets get started:
Let the total distance to her uncle's house is x.
On Saturday, they traveled 5/7 of totat distance means 5/7 * x = 5x / 7
So, the remaining distance would be x - 5x/7 = 2x / 7
They have traveled half of remaining distance on Sunday
means 1/2 * 2x/7 = x/7
It means 1/7 fraction of total distance traveled on Sunday. : Answer