This algebra video tutorial explains how to solve upstream and downstream problems such as distance rate time word problems. This first question asks you to solve for the speed of the boat in still water given the time it takes to travel upstream and downstream and given the speed of the river / water current in km/hr. The second problem asks you to find the speed of the airplane and the tail wind in mph given the distance traveled in miles and time it takes to travel in the forward and to make the return trip. This video shows you how to solve it using distance rate time tables or DRT tables. It provides the distance formula. This video contains plenty of examples and practice problems for you to master this concept.
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