Mateo took 3 hours to hike down a
mountain. His elevation decreased 9.6
kilometers over the 3 hours. Which
number best represents Mateo’s
average hourly elevation change?
A. -28.8 kilometers
B. -3.2 kilometers
C. 3.2 kilometers
D. 28.8 kilometers

To find Mateo’s average hourly elevation change, divide the total change in elevation by the total time taken. Here, he hiked down 9.6 kilometers over 3 hours. So, -9.6 km / 3 hours = -3.2 km/hour. Negative indicates a decrease in elevation, which is why we get -3.2 kilometers per hour.

So, the answer is B. -3.2 kilometers.

Not only was he making his descent, but this also emphasizes how crucial it is to pay attention to both the distance and time when calculating averages in physics and recreational activities!