Question

un motociclist se deplaseaza cu viteza de 54km/h. In cat timp parcurge distanta de 18 km?

Answer 1

viteza = distanta : timp

timpul = distanta : viteza

distanta = 18 km = 18 000 m

viteza = 54 km/h = 54 000 m / 3600 s = 15 m /s

timpul = 18 000 m : 15 m/s = 1200 s  

1200 s: 60 = 20 minute  

Answer 2

v = d/t => t = d/v = 18km/54km/h = 0.33h = 20 minute