Answer:
Malcom's average speed was 16 miles/hour.
Step-by-step explanation:
Given:
Distance from moon ridge to me tone = 32 miles.
Now including returned back journey.
So we can say that.
Total distance traveled = 
Also Given:
Time taken to travel total distance = 4 hours.
We need to find the average speed in miles per hour.
Solution:
Now we know that;
average speed is equal to Total distance traveled divided by Total time taken to travel the total distance.
framing in equation form we get;
average speed = 
Hence Malcom's average speed was 16 miles/hour.