Richard began driving from home on a trip averaging 30 miles per hour. How many miles per hour must Carla drive on average to catch up to him in exactly 3 hours if she leaves 30 minutes after Richard?  Choose the most appropriate option:
A) 35 B) 55 C) 39 D) 40 E) 60
After 30 mins, Richard travels 15 miles ahead Carla.   x = mph Carla need to catch up Richard in 3 hours. --&gt; relative speed of them = x-30   Carla needs to catch up 15 miles in 3 hours --&gt; (x−30)3=15--&gt; x=35   35nswer: 35
<result>A</result>
Richard began driving from home on a trip averaging 30 miles per hour. How many miles per hour must Carla drive on average to catch up to him in exactly 3 hours if she leaves 30 minutes after Richard?