Finding an answer of the following question is easy. I need help to understand why are we not getting the right answer if we do it by weighted average. Pls explain how u solved preferably through weighted average. OA to follow.
QUESTION:
Susan drove at an average speed of 30 miles per hour for the first 30 miles of a trip and then at an average speed of 60 miles per hour for the remaining 30 miles of the trip. If she made no stops during the trip, what was Susan's average speed, in miles per hour, for the entire trip7
A) 35
B) 40
C) 45
D) 50
E) 55
QUESTION:
Susan drove at an average speed of 30 miles per hour for the first 30 miles of a trip and then at an average speed of 60 miles per hour for the remaining 30 miles of the trip. If she made no stops during the trip, what was Susan's average speed, in miles per hour, for the entire trip7
A) 35
B) 40
C) 45
D) 50
E) 55
