One Way to Determine the Speed of the Current of a River

question 32

Multiple Choice

One way to determine the speed of the current of a river is to measure how long it takes a leaf to pass under a bridge. For example, let's say it takes a leaf 7 seconds to pass under a bridge that is 30 feet wide. What is the speed of the current in feet per hour? Round to the nearest integer. ​

• A) 12,857 feet per hour
• B) 2571 feet per hour
• C) 2 feet per hour
• D) 514 feet per hour
• E) 15,429 feet per hour

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