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------------------------------------------------ How many kilometers are in these races combined: eight 1500-meter races and three 3000-meter races?

To find the total distance in kilometers for the combined eight 1500-meter races and three 3000-meter races, first calculate the total distance in meters (12000 + 9000 = 21000 meters), and then convert the total distance into kilometers (21000 meters = 21 kilometers).

Explanation:

The student is asking how many kilometers are there in eight 1500-meter races and three 3000-meter races combined. To calculate the total distance in kilometers, we first need to find the total distance in meters by multiplying the number of races by the distance of each race and then add the totals together. Lastly, we convert the total distance from meters to kilometers.

Multiply the distance of one 1500-meter race by 8 races:
1500 meters/race imes 8 races = 12000 meters
Multiply the distance of one 3000-meter race by 3 races:
3000 meters/race imes 3 races = 9000 meters
Add the distances from both race types:
12000 meters + 9000 meters = 21000 meters
Convert the total distance from meters to kilometers:
21000 meters \/ 1000 meters/kilometer = 21 kilometers

Therefore, the total distance covered in the eight 1500-meter races and three 3000-meter races combined is 21 kilometers.