Question

42,195km corresponde a quantos metros

Answer 1

1 km = 1 000 m

Portanto, 
42,195 km = 1 000 x 42,195 = 42 195 m

Answer 2

1km=1000m
regra de três:
1km-----1000m
42,195km---x

x=42,195x1000
x=42195m