A train travels at 100 ft/s100 \text{ ft/s}100 ft/s. How fast is this in miles per hour (1 mile=5280 ft1 \text{ mile} = 5280 \text{ ft}1 mile=5280 ft)?
68.18 mph68.18 \text{ mph}68.18 mph
0.019 mph0.019 \text{ mph}0.019 mph
146.67 mph146.67 \text{ mph}146.67 mph
60 mph60 \text{ mph}60 mph