SOLUTION: A coast guard boat that patrols a river separating two countries cruises at 20knots in still water. The river flows at 4 knots. For each patrol the captain of the boat is ordered t

Question 351368: A coast guard boat that patrols a river separating two countries cruises at 20knots in still water. The river flows at 4 knots. For each patrol the captain of the boat is ordered to travel upstream and then return. His trip takes exactly 6 hours. How far upstream does the boat travel?
*I have drawn a picture but am having trouble writing an equation to solve.
Answer by scott8148(6628) (Show Source): You can put this solution on YOUR website!
t = d / r ___ the time upstream plus the time downstream equals 6 hr ___ the distance is the same

[d / (20-4)] + [d / (20+4)] = 6 ___ d/16 + d/24 = 6

multiplying by 48 ___ 3d + 2d = 288
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