During a trip, Francine traveled x percent of the total distance at an average speed of 20 miles per hour and the rest of the distance at an average speed of 80 miles per hour. In terms of x, what was Francineâ€™s average speed for the entire trip?  Choose the correct answer:	A) (180-x)/2	B) (x+60)/4	C) (300-x)/5	D) 600/(115-x)	E) 8,000/(400-4x)
E....   X% traveeled at 80 mph   100-X% traveeled at 20 mph   total timt taken = x/80 +(100-x)/20 = (400-4x)/80   Total distance = x+(100-x) = 100   Av speed = Tot Dis/Time Taken which is 8,000/(400-4x)
<result>E</result>
During a trip, Francine traveled x percent of the total distance at an average speed of 20 miles per hour and the rest of the distance at an average speed of 80 miles per hour. In terms of x, what was Francineâ€™s average speed for the entire trip?