Chemistry: A Molecular Approach (3rd Edition)

1. Convert km into miles using convertion $1 km = 0.6214 mile$ $212km \times 0.6214 \frac{miles}{km}=131.74 miles$ 2. Divide by speed (velocity) $18$ $miles/hour$ $\frac{131.74 miles}{18 mi/h} = 7.31 hours$ 3. $7.31 h = 7h$ and $0.31\times 60$ $minutes$ = 7 hours and 19 minutes