Martha takes a road trip from point A to point B. She drives x percent of the distance at 40 miles per hour and the remainder at 50 miles per hour. If Martha's average speed for the entire trip is represented as a fraction in its reduced form, in terms of x, which of the following is the numerator?  Choose the correct choice from the following choices:
A) 110  B) 300  C) 1,100  D) 3,000  E) 20,000
total distance = d   total time taken = x/(100*40) + (100-x)/(100*50)   speed = distance / time   gives numerator = 20000   Answer : 20,000
<result>E</result>
Martha takes a road trip from point A to point B. She drives x percent of the distance at 40 miles per hour and the remainder at 50 miles per hour. If Martha's average speed for the entire trip is represented as a fraction in its reduced form, in terms of x, which of the following is the numerator?