The distance from City A to City B is 220 miles. While driving from City A to City B, Bob drives at a constant speed of 40 miles per hour. Alice leaves City A 30 minutes after Bob. What is the minimum constant speed in miles per hour that Alice must exceed in order to arrive in City B before Bob?	Choose the correct choice from the following options
A) 44  B) 48  C) 50  D) 52  E) 54
The time it takes Bob to drive to City B is 220 / 40= 
<gadget id="calculator">220 / 40</gadget>
<output>11/2 = around 5.5</output>
5.5 hours.   Alice needs to take less than 5 hours for the trip.   Alice needs to exceed a constant speed of 220 / 5= 
<gadget id="calculator">220 / 5</gadget>
<output>44</output>
44 miles per hour.   The answer is 44.
<result>A</result>
The distance from City A to City B is 220 miles. While driving from City A to City B, Bob drives at a constant speed of 40 miles per hour. Alice leaves City A 30 minutes after Bob. What is the minimum constant speed in miles per hour that Alice must exceed in order to arrive in City B before Bob?