Martha takes a road trip from point A to point B. She drives x percent of the distance at 60 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? Select
A) 110 B) 300 C) 24,000 D) 3,000 E) 30,000
total distance = d   total time taken = x/(100*60) + (100-x)/(100*40)   speed = distance / time   gives numerator = 24000   Answer : 24,000
<result>C</result>
Martha takes a road trip from point A to point B. She drives x percent of the distance at 60 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?