Sid 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 Sid?  Choose one
A) 35
B) 55
C) 39
D) 40
E) 60
Carla starts 30 minutes later and it takes 3 hr for carla to meet Sid   So Sid total time travelled = 3hr + 30= 
<gadget id="calculator">+ 30</gadget>
<output>30</output>
30 * (3 1/2)= 105   so carla need to travle 105 to meet Sid in 3 hrs   speed of carla = 105/3= 
<gadget id="calculator">105/3</gadget>
<output>35</output>
35 miles per hour   35nswer is 35
<result>A</result>
Sid 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 Sid?