trip uphill to the store: distance = speed * time = (15mph)*(12minutes/60 minutes per hour) = (15mph)*(0.2 hours) = 3 miles trip downhill back home is along the same path so the trip downhill was also equal to 3 miles. So the the entire trip was a distance of 6 miles 3 miles uphill and 3 miles downhill. So the average speed = (15mph uphill + 30mph downhill)/2 = 45 mph/2 = 22.5 mpg So the average speed of the entire trip uphill and downhill is 22.5 mph
Starting at home, ishann traveled uphill to the grocery store for 12 minutes at just 15 mph. Then he traveled back home along the same path downhill at a speed of 30 mph. What is his average speed for the entire trip from home to the grocery store and back?