I biciclist 4 min (4x60s = 240s) cu 18 m/s
=> daca la 1 s ............ 18 m
la 240 s ................. a = 4320 m
II biciclist a parcurs 4320 m in 9 min (9x60s = 540 s)
4320 m ..................... 540 s
b m ............................ 1 s => b = 8 m
=> vit. biciclistului 2 = 8 m/s