Let t = # of hours Brandon drove
5.75 - t = # of hours Pat drove
Solve the equation 100t + 90(5.75 - t) = 545
100t + 517.5 - 90t = 545
10t + 517.5 = 545
10t = 27.5
T = 2.75 hrs. Brandon drove
5.75 - t = 5.75 - 2.75 = 3 hrs. Pat drove