ai doua variante :
10 km ........ .40 min
25 km ..........x = 40 x 25 : 10 = 100 minute = 1 h si 40 minute
viteza = distanta / timp = 10 km/ 40 min = 10 000 m / 40 x 60 s = 10 000 / 2400 s = 4,16 m/s
timpul = distanta / viteza = 25 ooo m / 4,16 m/s = 6000 secunde = 100 min = 1h40 minute
