The distance from City A to City B is 180 miles. While driving from City A to City B, Cara drives at a constant speed of 30 miles per hour. Dan leaves City A 60 minutes after Cara. What is the minimum constant speed in miles per hour that Dan must exceed in order to arrive in City B before Cara?	Choose the correct choice from the following choices:
A) 42
B) 44
C) 46
D) 36
E) 50
The time it takes Cara to drive to City B is 180 / 30= 
<gadget id="calculator">180 / 30</gadget>
<output>6</output>
6 hours.   Dan needs to take less than 5 hours for the trip.   Dan needs to exceed a constant speed of  180 / 5= 
<gadget id="calculator"> 180 / 5</gadget>
<output>36</output>
36 miles per hour.   The answer is 36.
<result>D</result>
The distance from City A to City B is 180 miles. While driving from City A to City B, Cara drives at a constant speed of 30 miles per hour. Dan leaves City A 60 minutes after Cara. What is the minimum constant speed in miles per hour that Dan must exceed in order to arrive in City B before Cara?