SOLUTION: An object floating freely on a river takes 50 seconds to pass under a bridge that is 100 feet wide. To the nearest tenth of a mile, what is the speed of the river's current in mul

Question 666873: An object floating freely on a river takes 50 seconds to pass under a bridge that is 100 feet wide. To the nearest tenth of a mile, what is the speed of the river's current in mules per hour? (1 mile= 5280 feet) Be careful with your units.
Answer by lwsshak3(11628) (Show Source): You can put this solution on YOUR website!
An object floating freely on a river takes 50 seconds to pass under a bridge that is 100 feet wide. To the nearest tenth of a mile, what is the speed of the river's current in miles per hour?
**
100 ft/50sec*3600sec/hr*mile/5280ft
ft and sec cancel out, leaving:
100*3600/50*5280 miles/hr≈1.36 mi/hr
speed of the river's current≈1.36 mi/hr
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