The distance from City A to City B is 120 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:
A) 42
B) 44
C) 46
D) 48
E) 40
The time it takes Cara to drive to City B is 120 / 30= 
<gadget id="calculator">120 / 30</gadget>
<output>4</output>
4 hours.   Dan needs to take less than 3 hours for the trip.   Dan needs to exceed a constant speed of  120 / 3= 
<gadget id="calculator"> 120 / 3</gadget>
<output>40</output>
40 miles per hour.   The answer is 40.
<result>E</result>
The distance from City A to City B is 120 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?