Question

Starting at home, Emily traveled uphill to the hardware store for 60 minutes at just 6 mph. She then traveled back home along the same path downhill at a speed of 12 mph. What is her average speed for the entire trip from home to the hardware store and back? (I need the rate version for this. 24 and 6 are not correct)

Answer 1

 The distance traveled was 6 miles  (6 mph times 1 hour).

The total distance traveled was 12 miles.

The downhill journey lasted   (6 mi) / (12 mph), or 1/2 hr.

Thus, the average speed was 

12 miles         12 mi
------------- = ------------ = 8 mph
(1 1/2 hr)       (3/2) hr