Question

Zamien na metry /s 90km/s 120km/s zamien na km/h 10m/s 75m/s

Answer 1

1 km = 1000 m
1 h = 3600 s

90 km/s = 90 * 1000m/s = 90 000 m/s
120 km/s = 120 * 1000m/s = 120 000 m/s

10 m/s = 10 * 0,001km/(1/3600h) = 36 km/h
75 m/s = 75 * 0,001km/(1/3600h) = 270 km/h