The distance from City A to City B is 180 miles. While driving from City A to City B, Ed drives at a constant speed of 30 miles per hour. Flora leaves City A 2 hours after Ed. What is the minimum constant speed in miles per hour that Flora must exceed in order to arrive in City B before Ed?
Choose the correct choice from the following answers
A) 35 B) 40 C) 45 D) 50 E) 55
The time it takes Ed to drive to City B is 180 / 30= 
<gadget id="calculator">180 / 30</gadget>
<output>6</output>
6 hours.   Flora needs to take less than 4 hours for the trip.   Flora needs to exceed a constant speed of 180 / 4= 
<gadget id="calculator">180 / 4</gadget>
<output>45</output>
45 miles per hour.   The answer is 45.
<result>C</result>
The distance from City A to City B is 180 miles. While driving from City A to City B, Ed drives at a constant speed of 30 miles per hour. Flora leaves City A 2 hours after Ed. What is the minimum constant speed in miles per hour that Flora must exceed in order to arrive in City B before Ed?