SOLUTION: Sam runs for 15 minutes at 8 mph, and then jogs for 45 minutes at 4 mph. What is his average speed during this time? I have absolutely no idea how I would even begin to do this

Question 1088688: Sam runs for 15 minutes at 8 mph, and then jogs for 45 minutes at 4 mph. What is his average speed during this time?
I have absolutely no idea how I would even begin to do this problem. Thanks for the help.
Answer by ikleyn(52817) (Show Source): You can put this solution on YOUR website!
.

The average speed is, by the definition, the total distance divided by total time.


The total distance is   = 2 + 3 = 5 miles.


    Exlanation.  = 15 minutes = 1/4 of an hour.

                 = 45 minutes = 3/4 of an hour.


The total time is 15 minutes + 45 minutes = 1 hour.


Hence, the average speed is   = 5 mph.

Solved.

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