Martha takes a road trip from point A to point B. She drives x percent of the distance at 50 miles per hour and the remainder at 40 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 answers.
A) 110	B) 20,000	C) 1,100	D) 3,000	E) 30,000
total distance = d   total time taken = x/(100*50) + (100-x)/(100*40)   speed = distance / time   gives numerator = 20000   Answer : 20,000
<result>B</result>
Martha takes a road trip from point A to point B. She drives x percent of the distance at 50 miles per hour and the remainder at 40 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?