Answer:
3.60 cm/hr
Explanation:
We need to convert km to cm and years to hours.
1km = 10^3m by definition
1cm = 10^-2 m by definition
(1km/10^3m)*(10^-2m/1cm) = 1 x 10^-5
1cm = 1x10^-5 km or (1cm/1x10^-5km) Conversion factor to go from km to cm
1 year = 365.25 days
1 day = 24 hours
(1 year)*(365.25 days/year)*(24 hours/day) = 8766 hours/year or (1 year/8766 hours) Conversion factor to go from years to hours.
3 kilometers every 9.5 years. Use the two conversion factors from above to change km to cm and years to hours:
[(3 km)/(9.5 years)]*[(1 year/8766 hours)]*[(1cm/1x10^-5 km) = 3.60 cm/hr