Math CentralQuandaries & Queries


Question from Cindy, a parent:

A boat travels downstream m nautical miles at d knots. It travels upstream m nautical miles at u knots. What is the average speed for the entire trip?

Hi Cindy,

A knot is a nautical mile per hour and thus if you travel downstream m nautical miles at d nautical miles per hour it takes

time .

How long did the boat travel upstream? What was the total time for the entire trip? What was the total distance travelled? What was the average speed?


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