Question 336782
35+.10m<25+.25m
35-25<.25m-.10m
10<.15m
10/.15<m
66.67<m up to 66.67 miles the first company is the better deal.
Proof:
let m=67
35+.10*67<25+.25*67
35+6.7<25+16.75
41.7<41.75