On the first day of her vacation, Louisa traveled 240 miles. On the second day, traveling at the same average speed, she traveled 420 miles. If the 240-mile trip took 3 hours less than the 420-mile trip, what was the average speed, in miles per hour?
Choose the correct choice from the following choices
A) 65	B) 50	C) 55	D) 60	E) 58
(time)*(rate) = (distance)--&gt;(rate) = (distance)/(time)--&gt; given:(rate) = 240/t = 420/(t+3)--&gt;4/t = 7/(t+3)--&gt;4t+12=7t ----&gt;3t= 12 . t= 4 ----&gt;(rate ) = 240/4= 
<gadget id="calculator">240/4</gadget>
<output>60</output>
60   Answer: 60
<result>D</result>
On the first day of her vacation, Louisa traveled 240 miles. On the second day, traveling at the same average speed, she traveled 420 miles. If the 240-mile trip took 3 hours less than the 420-mile trip, what was the average speed, in miles per hour?