If employee A logged 120 hours of travel in 4 years and employee B logged hours of travel at a 20% higher rate, how many more hours did employee B have than employee A after 1.5 years?

rate of logging for a: 120hours/4years

=30hours/year

rate of logging for b = 30 + (30x 2) = 36

hours / year

30 hours / year x 1.5 years = 45 hours

36 hours / year x 1.5 years = 54 hours

54-45 = 9 hours