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 120 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?
Select: A) 42 B) 44 C) 60 D) 48 E) 50
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 2 hours for the trip.   Dan needs to exceed a constant speed of  120 / 2= 
<gadget id="calculator"> 120 / 2</gadget>
<output>60</output>
60 miles per hour.   The answer is 60.
<result>C</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 120 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?