Question 331475
let the number of miles Bob does be x so that both plans are same.
plan a = 51.98+0.14x
plan b = 43.98+0.18x
..
51.98+0.14x= 43.98+0.18x
0.04x =51.98-43.98
0.04x=8
x= 8/0.04
x=200 miles
..