Final answer:
The time it takes for a car to travel 3000 m at a constant speed of 20 m/s is 150 seconds, which is also represented as 1.5 x 10² seconds or option D.
Step-by-step explanation:
To calculate the time it takes for a car to travel a certain distance at a constant speed, you can use the formula time (t) = distance (d) / speed (v).
In this problem, the car traveled 3000 meters (m) at a constant speed of 20 meters per second (m/s). Plugging these values into the formula gives us:
t = 3000 m / 20 m/s = 150 seconds.
So, the correct answer is D) 1.5 x 10² s, because 150 seconds can also be written as 1.5 times 10 to the power of 2 seconds.