The correct option is B Sammy; 1 km
Given, Jay rode 2 kms on his bike.
Also given that, Sammy rode 3000 mts on her bike.
1000 m=1 km
∴3000 m=3×1000 m =3×1 km =3 km
∴ Sammy rode 3 kms on her bike.
Therefore, Sammy rode farther because she rode 3 kms and Jay only rode 2 kms and she rode 1 km (= 3 km - 2 km) more than Jay.