<PRE><B>Question 339728</B>
she runs an 7-mile course, 4 miles of which is on level ground and 3 miles of which is downhill.
 It takes her 40 minutes to run the level part of the course and 20 minutes to
 run the downhill part of the course.
 Find her average speed in minutes per mile and in miles per minute for each part of the course.
:
The level part:
40/4 = 10 min/mi, and 4/10 = .4 mi/min
:
down hill part;
20/3 = 6.67 min/mi, and 3/6.67 = .45 mi/min </PRE>