Tim has an after-school delivery service that he provides for several small retailers in town. He uses his bicycle and charges $1.25 for a delivery made within 1 1/2 mi, $1.70 for a delivery of at least 1 1/2 mi but less than 2 miles, and so on. If Tim raised his rates by 10%, what would he be paid to deliver a package 3 1/8 miles

Answer 1

Apparently he charges 45 cents per 1/2 mile over 1 1/2 miles.
So, with the price rise, he'd charge
1.70 * 1.10 = 1.87 for the first 1 1/2 miles, and
0.45 * 1.10 = 0.495 for each 1/2 mile after that.
So, how many extra 1/2 miles does it take to get to over 3 miles?