Jeff takes 20 minutes to jog around the race course one time, and 30 minutes to jog around a second time. what is his average speed in miles per hour for the whole jog if the course is 3 miles long?

7.2 average miles per hour

Cross multiply to solve for x:

6miles/ 50 minutes = X (how many miles)/ 60 minutes

6*60=50x

360=50x

360/50= x

7.2 = x

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answer; niosh, the national institute for occupational safety and health;