Final answer:
The Joker was 2,250 meters, or 2.25 kilometers, away from Batman when the chase started.
Step-by-step explanation:
To solve how far away the Joker was from Batman, we can use the formula for distance which is distance = speed × time. With the given speed of Batman gliding towards the Joker at 75 m/s and the time taken to catch him being 30 seconds, the distance can be calculated as:
Distance = 75 m/s × 30 s = 2250 m
To convert meters into kilometers, we divide the distance by 1000, because there are 1000 meters in a kilometer. Therefore:
Distance in kilometers = 2250 m / 1000 = 2.25 km
Thus, the Joker was 2.25 kilometers away from Batman when the chase started.