Answer : 4/7
Here it's given that Brad's family travelled 2/7 of the total distance to his uncle's house on Saturday . So if we assume the total distance to be 1 , then the remaining distance will be ,
Again it's given that they travelled 4/5 of the remaining distance on Sunday . So , the distance travelled would be ,
Therefore Brad's family travelled 4/7 of the total distance on Sunday .