Here's how to figure out how long it takes a ball thrown at 150 kph to travel 20 meters:

1. Convert kph to meters per second (m/s):

* 1 kilometer (km) = 1000 meters (m)

* 1 hour (h) = 3600 seconds (s)

* 150 kph * (1000 m/km) * (1 h/3600 s) = 41.67 m/s

2. Use the formula for distance, velocity, and time:

* Distance (d) = Velocity (v) * Time (t)

3. Solve for time:

* Time (t) = Distance (d) / Velocity (v)

* Time (t) = 20 m / 41.67 m/s

* Time (t) ≈ 0.48 seconds

Therefore, it takes approximately 0.48 seconds for the ball to travel 20 meters.