Erin Was Driving Home from College $18 \frac{1}{2}$ Hours and the Distance Traveled Was 1242 Miles, What Was

Erin was driving home from college. During the first day of driving, Erin averaged 62 miles per hour. On the second day, she drove at an average speed of 72 miles per hour. If her total driving time for the two days was $18 \frac{1}{2}$ hours and the distance traveled was 1242 miles, what was Erin's driving time for each day?

A) first day: $10 \mathrm{hr}$
Second day: $8 \frac{1}{2} \mathrm{hr}$

B) first day: $9 \frac{1}{2} \mathrm{hr}$
Second day: $9 \mathrm{hr}$

C) first day: $8 \mathrm{hr}$
Second day: $10 \frac{1}{2} \mathrm{hr}$

D) first day: $9 \mathrm{hr}$
Second day: $9 \frac{1}{2} \mathrm{hr}$