## Chemistry: A Molecular Approach (3rd Edition)

$50mins$
1. $1$ km $=$ $0.6214$ miles 2. $10 km \times \frac{0.6214 miles}{1 km} \times \frac{1hr}{7.5 miles} \times \frac{60 min}{1hr} =49.7 min$ 3. For the correct significant figures, round to $50min$.